JS: Map.prototype.size

By Xah Lee. Date: .

New in ES2015.

map_obj.size → returns the total count of entries in map_obj.

// size of map
const m = new Map([[3, "n3"], [4, "n4"], [5, "n5"] ]);
console.log(m.size); // 3

JS Map

  1. the Map Object Tutorial
  2. Iterate Over Map Object
  3. Convert Object to/from Map
  4. Map Filter
  5. Reverse Key/Value

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