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flat & flatMap array methods

Methods to flatten possible sub arrays which are found in the array with the help of concatenating their elements.

Last updated on : 2025-11-11

Browser Versions

Edge

Firefox

Chrome

Safari

Opera

5.5 - 11

12 - 18

79 - 142

2 - 61

62 - 147

4 - 68

69 - 145

3.2 - 11.1

12.1 - 26.2

9.5 - 55

56 - 122

Fully Supported

Partially

No Support

Specifications

ECMAScript Language Specification # sec-array.prototype.flatmap

Syntax

// Arrow function flatMap((currentValue) => { /* ... */
 } ) flatMap((currentValue, index) => { /* ... */
 } ) flatMap((currentValue, index, array) => { /* ... */
 } ) // Callback function flatMap(callbackFn) flatMap(callbackFn, thisArg) // Inline callback function flatMap(function(currentValue) { /* ... */
 }) flatMap(function(currentValue, index) { /* ... */
 }) flatMap(function(currentValue, index, array){ /* ... */
 }) flatMap(function(currentValue, index, array) { /* ... */
 }, thisArg)

Browser Compatibility

flat & flatMap array methods on IE is not supported on any IE versions.

flat & flatMap array methods on Edge is fully supported on 79-142, and not supported on 12-18 Edge versions.

flat & flatMap array methods on Firefox is fully supported on 62-147, and not supported on 2-61 Firefox versions.

flat & flatMap array methods on Chrome is fully supported on 69-145, and not supported on 4-68 Chrome versions.

flat & flatMap array methods on Safari is fully supported on 12.1-26.2, and not supported on 3.2-11.1 Safari versions.

flat & flatMap array methods on Opera is fully supported on 56-122, and not supported on 9.5-55 Opera versions.

flat & flatMap array methods on Safari on iOS is fully supported on 12-26.1, and not supported on 3.2-11.3 Safari on iOS versions.

flat & flatMap array methods on Android Browser is fully supported on 97-142, and not supported on 2.3-4 Android Browser versions.

flat & flatMap array methods on Opera Mobile is fully supported on 64-80, and not supported on 10-12 Opera Mobile versions.

flat & flatMap array methods on Chrome for Android is fully supported on all Chrome for Android versions.

flat & flatMap array methods on Firefox for Android is fully supported on all Firefox for Android versions.

flat & flatMap array methods on Samsung Internet is fully supported on 10.1-29, and not supported on 4-9.2 Samsung Internet versions.

Browser Support for flat & flatMap array methods

flat & flatMap array methods on Chrome

flat & flatMap array methods on Safari

flat & flatMap array methods on Firefox

flat & flatMap array methods on Internet Explorer

flat & flatMap array methods on Opera

flat & flatMap array methods on Edge

References

Data sourced from

High

Overall Browser Compatibility Score

Note:flat & flatMap array methods shows a browser compatibility score of 92. This is a collective score out of 100 to represent browser support of a web technology. The higher this score is, the greater is the browser compatibility. The browser compatibility score is not a 100% reflection for every browser and the web technology support. However, it does give you an estimate on how much you should rely on a particular web technology in terms of browser compatibility.

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