JavaScript Map size
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Definition and usage
size Property returns the number of elements in the Map.
Instance
// Create a Map const fruits = new Map([ ["apples", 500], ["bananas", 300], ["oranges", 200] ]); // Get the size of the Map let x = fruits.size;
Syntax
map.size
Parameters
None.
Return value
| Type | Description |
|---|---|
| Number | The number of elements in the Map. |
Browser support
map.size Is a feature of ECMAScript6 (ES6).
Starting from June 2017, all modern browsers support ES6 (JavaScript 2015):
| Chrome | Edge | Firefox | Safari | Opera |
|---|---|---|---|---|
| Chrome 51 | Edge 15 | Firefox 54 | Safari 10 | Opera 38 |
| May 2016 | April 2017 | June 2017 | September 2016 | June 2016 |
map.size Not Supported in Internet Explorer.
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