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update doc

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Justin Lin
2021-03-15 18:14:46 +08:00
parent 74747cb2f5
commit 1b763a790e
1 changed files with 25 additions and 0 deletions
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docs/lib3x-hashmap.md
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@@ -42,3 +42,28 @@ This function maps keys to values. You can use the following to process the retu
echo(hashmap_keys(m3)); // a list contains "k2", "k2", "k3"
echo(hashmap_values(m3)); // a list contains 20, 30, 40
echo(hashmap_entries(m3)); // a list contains ["k2", 20], ["k3", 30], ["k4", 40]
Want to simulate class-based OO in OpenSCAD? Here's my experiment.
use <util/map/hashmap.scad>;
use <util/map/hashmap_get.scad>;
function methods(mths) = hashmap(mths);
function _(name, instance) = hashmap_get(instance, name);
function clz_list(data) = function(name) _(name,
methods([
["get", function(i) data[i]],
["append", function(n) clz_list(concat(data, [n]))]
])
);
lt1 = clz_list([10, 20]);
assert(lt1("get")(0) == 10);
assert(lt1("get")(1) == 20);
lt2 = lt1("append")(30);
assert(lt2("get")(0) == 10);
assert(lt2("get")(1) == 20);
assert(lt2("get")(2) == 30);