Map.prototype.keys()
The keys() method returns a new
iterator object
that contains the keys for each element in the Map object in insertion order.
Syntax
keys()
Return value
A new Map iterator object.
Examples
Using keys()
var myMap = new Map();
myMap.set('0', 'foo');
myMap.set(1, 'bar');
myMap.set({}, 'baz');
var mapIter = myMap.keys();
console.log(mapIter.next().value); // "0"
console.log(mapIter.next().value); // 1
console.log(mapIter.next().value); // Object
Specifications
| Specification |
|---|
| ECMAScript Language Specification # sec-map.prototype.keys |
Browser compatibility
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