Can I use
?

flat & flatMap array methods

- OTHER

Methods to flatten any sub-arrays found in an array by concatenating their elements.

IE

  1. 5.5 - 10: Not supported
  2. 11: Not supported

Edge

  1. 12 - 18: Not supported
  2. 79 - 87: Supported
  3. 88: Supported

Firefox

  1. 2 - 61: Not supported
  2. 62 - 84: Supported
  3. 85: Supported
  4. 86 - 87: Supported

Chrome

  1. 4 - 68: Not supported
  2. 69 - 87: Supported
  3. 88: Supported
  4. 89 - 91: Supported

Safari

  1. 3.1 - 11.1: Not supported
  2. 12 - 13.1: Supported
  3. 14: Supported
  4. TP: Supported

Opera

  1. 9 - 55: Not supported
  2. 56 - 72: Supported
  3. 73: Supported

iOS Safari

  1. 3.2 - 11.4: Not supported
  2. 12 - 13.7: Supported
  3. 14: Supported

Opera Mini

  1. all: Not supported

Android Browser

  1. 2.1 - 4.4.4: Not supported
  2. 81: Supported

Opera Mobile

  1. 10 - 12.1: Not supported
  2. 59: Supported

Chrome for Android

  1. 88: Supported

Firefox for Android

  1. 85: Supported

UC Browser for Android

  1. 12.12: Not supported

Samsung Internet

  1. 4 - 9.2: Not supported
  2. 10.1 - 12.0: Supported
  3. 13.0: Supported

QQ Browser

  1. 10.4: Not supported

Baidu Browser

  1. 7.12: Not supported

KaiOS Browser

  1. 2.5: Not supported
Resources:
MDN article on Array.prototype.flat
MDN article on Array.prototype.flatMap
Article on the history of the `flat` methods
Polyfill for flat & flatMap
Polyfill for this feature is available in the core-js library