Map: map.get()

Map.prototype.get returns the element from the map for a key

get(key) returns the value stored for this key

let map = new Map(); map.set('key', 'value'); const value = map.get; assert.equal(value, 'value');

multiple calls still return the same value

let map = new Map(); map.set('value', 'value'); var value = map.get(map.get(map.get())); assert.equal(value, 'value');

requires exactly the value as passed to set()

let map = new Map(); const obj = {}; map.set({}, 'object is key'); assert.equal(map.get(obj), 'object is key');

leave out the key, and you get the value set for the key undefined (void 0)

let map = new Map(); map.set(void 0, 'yo'); const value = map.get(___); assert.equal(value, 'yo');

returns undefined for an unknown key

let map = new Map(); map.set(void 0, 1); const value = map.get(); assert.equal(value, void 0);

Required Knowledge

• array (Iterator)

Related Katas

Map

• basics
• map.get()
• map.set()
• initialize
• map.has()

Difficulty Level

INTERMEDIATE

First Published

22 May 2015

Stats

5 tests to solve