Indicates whether an element with a key exists.
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map.has() indicates whether an element with a key exists
- finds nothing in an empty map
- finds an element by it`s key
undefined as key too
- does not coerce keys
- after removal (using
map.delete(<key>)) it doesnt find the element anymore
- adding an item (using
map.set(key, value)) later will make
has() return true
A video (15min) documenting how this kata was created.