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# undefined
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JavaScript has two primitive values used to signal absent or uninitialized value: `null` (absent) and `undefined` (unintialized).
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JavaScript has two primitive values used to signal absent or uninitialized value: `null` (absent) and `undefined` (uninitialized).
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TypeScript has two corresponding _types_ by the same names. How these types behave depends on whether you have the `strictNullChecks` option on.
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