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47
docs/content/en/functions/compare/Cond.md
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47
docs/content/en/functions/compare/Cond.md
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---
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title: compare.Conditional
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linkTitle: cond
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description: Returns one of two arguments depending on the value of the control argument.
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categories: [functions]
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keywords: []
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menu:
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docs:
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parent: functions
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function:
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aliases: [cond]
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returnType: any
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signatures: [compare.Conditional CONTROL ARG1 ARG2]
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relatedFunctions:
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- compare.Conditional
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- compare.Default
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aliases: [/functions/cond]
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---
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The CONTROL argument is a boolean value that indicates whether the function should return ARG1 or ARG2. If CONTROL is `true`, the function returns ARG1. Otherwise, the function returns ARG2.
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```go-html-template
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{{ $qty := 42 }}
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{{ cond (le $qty 3) "few" "many" }} → "many"
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```
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The CONTROL argument must be either `true` or `false`. To cast a non-boolean value to boolean, pass it through the `not` operator twice.
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```go-html-template
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{{ cond (42 | not | not) "truthy" "falsy" }} → "truthy"
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{{ cond ("" | not | not) "truthy" "falsy" }} → "falsy"
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```
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{{% note %}}
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Unlike [ternary operators] in other languages, the `cond` function does not perform [short-circuit evaluation]. The function evaluates both ARG1 and ARG2, regardless of the CONTROL value.
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[short-circuit evaluation]: https://en.wikipedia.org/wiki/Short-circuit_evaluation
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[ternary operators]: https://en.wikipedia.org/wiki/Ternary_conditional_operator
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{{% /note %}}
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Due to the absence of short-circuit evaluation, these examples throw an error:
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```go-html-template
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{{ cond true "true" (div 1 0) }}
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{{ cond false (div 1 0) "false" }}
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```
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88
docs/content/en/functions/compare/Default.md
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docs/content/en/functions/compare/Default.md
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---
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title: compare.Default
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linkTitle: default
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description: Allows setting a default value that can be returned if a first value is not set.
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categories: [functions]
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keywords: []
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menu:
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docs:
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parent: functions
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function:
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aliases: [default]
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returnType: any
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signatures: [compare.Default DEFAULT INPUT]
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relatedFunctions:
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- compare.Conditional
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- compare.Default
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aliases: [/functions/default]
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---
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`default` checks whether a given value is set and returns a default value if it is not. *Set* in this context means different things depending on the data type:
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* non-zero for numeric types and times
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* non-zero length for strings, arrays, slices, and maps
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* any boolean or struct value
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* non-nil for any other types
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`default` function examples reference the following content page:
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{{< code file="content/posts/default-function-example.md" >}}
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---
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title: Sane Defaults
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seo_title:
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date: 2017-02-18
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font:
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oldparam: The default function helps make your templating DRYer.
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newparam:
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---
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{{< /code >}}
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`default` can be written in more than one way:
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```go-html-template
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{{ .Params.font | default "Roboto" }}
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{{ default "Roboto" .Params.font }}
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```
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Both of the above `default` function calls return `Roboto`.
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A `default` value, however, does not need to be hard coded like the previous example. The `default` value can be a variable or pulled directly from the front matter using dot notation:
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```go-html-template
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{{ $old := .Params.oldparam }}
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<p>{{ .Params.newparam | default $old }}</p>
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```
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Which would return:
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```html
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<p>The default function helps make your templating DRYer.</p>
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```
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And then using dot notation
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```go-html-template
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<title>{{ .Params.seo_title | default .Title }}</title>
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```
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Which would return
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```html
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<title>Sane Defaults</title>
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```
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The following have equivalent return values but are far less terse. This demonstrates the utility of `default`:
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Using `if`:
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```go-html-template
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<title>{{ if .Params.seo_title }}{{ .Params.seo_title }}{{ else }}{{ .Title }}{{ end }}</title>
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=> Sane Defaults
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```
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Using `with`:
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```go-html-template
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<title>{{ with .Params.seo_title }}{{ . }}{{ else }}{{ .Title }}{{ end }}</title>
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=> Sane Defaults
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```
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32
docs/content/en/functions/compare/Eq.md
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docs/content/en/functions/compare/Eq.md
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---
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title: compare.Eq
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linkTitle: eq
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description: Returns the boolean truth of arg1 == arg2 || arg1 == arg3.
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categories: [functions]
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keywords: []
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menu:
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docs:
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parent: functions
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function:
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aliases: [eq]
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returnType: bool
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signatures: ['compare.Eq ARG1 ARG2 [ARG...]']
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relatedFunctions:
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- compare.Eq
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- compare.Ge
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- compare.Gt
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- compare.Le
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- compare.Lt
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- compare.Ne
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aliases: [/functions/eq]
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---
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```go-html-template
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{{ eq 1 1 }} → true
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{{ eq 1 2 }} → false
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{{ eq 1 1 1 }} → true
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{{ eq 1 1 2 }} → true
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{{ eq 1 2 1 }} → true
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{{ eq 1 2 2 }} → false
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```
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37
docs/content/en/functions/compare/Ge.md
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docs/content/en/functions/compare/Ge.md
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---
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title: compare.Ge
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linkTitle: ge
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description: Returns the boolean truth of arg1 >= arg2 && arg1 >= arg3.
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categories: [functions]
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keywords: []
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menu:
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docs:
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parent: functions
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function:
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aliases: [ge]
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returnType: bool
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signatures: ['compare.Ge ARG1 ARG2 [ARG...]']
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relatedFunctions:
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- compare.Eq
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- compare.Ge
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- compare.Gt
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- compare.Le
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- compare.Lt
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- compare.Ne
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aliases: [/functions/ge]
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---
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```go-html-template
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{{ ge 1 1 }} → true
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{{ ge 1 2 }} → false
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{{ ge 2 1 }} → true
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{{ ge 1 1 1 }} → true
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{{ ge 1 1 2 }} → false
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{{ ge 1 2 1 }} → false
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{{ ge 1 2 2 }} → false
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{{ ge 2 1 1 }} → true
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{{ ge 2 1 2 }} → true
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{{ ge 2 2 1 }} → true
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```
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37
docs/content/en/functions/compare/Gt.md
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37
docs/content/en/functions/compare/Gt.md
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---
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title: compare.Gt
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linkTitle: gt
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description: Returns the boolean truth of arg1 > arg2 && arg1 > arg3.
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categories: [functions]
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keywords: []
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menu:
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docs:
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parent: functions
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function:
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aliases: [gt]
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returnType: bool
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signatures: ['compare.Gt ARG1 ARG2 [ARG...]']
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relatedFunctions:
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- compare.Eq
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- compare.Ge
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- compare.Gt
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- compare.Le
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- compare.Lt
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- compare.Ne
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aliases: [/functions/gt]
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---
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```go-html-template
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{{ gt 1 1 }} → false
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{{ gt 1 2 }} → false
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{{ gt 2 1 }} → true
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{{ gt 1 1 1 }} → false
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{{ gt 1 1 2 }} → false
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{{ gt 1 2 1 }} → false
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{{ gt 1 2 2 }} → false
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{{ gt 2 1 1 }} → true
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{{ gt 2 1 2 }} → false
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{{ gt 2 2 1 }} → false
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```
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37
docs/content/en/functions/compare/Le.md
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docs/content/en/functions/compare/Le.md
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---
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title: compare.Le
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linkTitle: le
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description: Returns the boolean truth of arg1 <= arg2 && arg1 <= arg3.
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categories: [functions]
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keywords: []
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menu:
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docs:
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parent: functions
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function:
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aliases: [le]
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returnType: bool
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signatures: ['compare.Le ARG1 ARG2 [ARG...]']
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relatedFunctions:
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- compare.Eq
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- compare.Ge
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- compare.Gt
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- compare.Le
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- compare.Lt
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- compare.Ne
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aliases: [/functions/le]
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---
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```go-html-template
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{{ le 1 1 }} → true
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{{ le 1 2 }} → true
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{{ le 2 1 }} → false
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{{ le 1 1 1 }} → true
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{{ le 1 1 2 }} → true
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{{ le 1 2 1 }} → true
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{{ le 1 2 2 }} → true
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{{ le 2 1 1 }} → false
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{{ le 2 1 2 }} → false
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{{ le 2 2 1 }} → false
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```
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37
docs/content/en/functions/compare/Lt.md
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docs/content/en/functions/compare/Lt.md
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---
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title: compare.Lt
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linkTitle: lt
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description: Returns the boolean truth of arg1 < arg2 && arg1 < arg3.
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categories: [functions]
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keywords: []
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menu:
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docs:
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parent: functions
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function:
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aliases: [lt]
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returnType: bool
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signatures: ['compare.Lt ARG1 ARG2 [ARG...]']
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relatedFunctions:
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- compare.Eq
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- compare.Ge
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- compare.Gt
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- compare.Le
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- compare.Lt
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- compare.Ne
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aliases: [/functions/lt]
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---
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```go-html-template
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{{ lt 1 1 }} → false
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{{ lt 1 2 }} → true
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{{ lt 2 1 }} → false
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{{ lt 1 1 1 }} → false
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{{ lt 1 1 2 }} → false
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{{ lt 1 2 1 }} → false
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{{ lt 1 2 2 }} → true
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{{ lt 2 1 1 }} → false
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{{ lt 2 1 2 }} → false
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{{ lt 2 2 1 }} → false
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```
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docs/content/en/functions/compare/Ne.md
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docs/content/en/functions/compare/Ne.md
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---
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title: compare.Ne
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linkTitle: ne
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description: Returns the boolean truth of arg1 != arg2 && arg1 != arg3.
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categories: [functions]
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keywords: []
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menu:
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docs:
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parent: functions
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function:
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aliases: [ne]
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returnType: bool
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signatures: ['compare.Ne ARG1 ARG2 [ARG...]']
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relatedFunctions:
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- compare.Eq
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- compare.Ge
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- compare.Gt
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- compare.Le
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- compare.Lt
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- compare.Ne
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aliases: [/functions/ne]
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---
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```go-html-template
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{{ ne 1 1 }} → false
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{{ ne 1 2 }} → true
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{{ ne 1 1 1 }} → false
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{{ ne 1 1 2 }} → false
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{{ ne 1 2 1 }} → false
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{{ ne 1 2 2 }} → true
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```
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