JavaScript: Map.prototype.get
New in JS2015.
mapObj.get(key)
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Return the value of the key key in map mapObj.
If key isn't found, return undefined.
const xx = new Map([[4, "n4"], [5, "n5"]]); // get the value of a key console.log(xx.get(5) === "n5"); console.log(xx.get(99) === undefined);