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dotSCAD/docs/lib3x-hashmap_keys.md
2021-03-09 17:11:02 +08:00

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# hashmap_keys
Returns a list containing all keys in a [util/map/hashmap](https://openhome.cc/eGossip/OpenSCAD/lib3x-hashmap.html).
**Since:** 3.0
## Parameters
- `map` : The map.
## Examples
use <util/map/hashmap.scad>;
use <util/map/hashmap_keys.scad>;
m = hashmap([["k1", 10], ["k2", 20], ["k3", 30]]);
echo(hashmap_keys(m)); // a list contains "k1", "k2", "k3"