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map() vs forEach() in JS

map() The map() method loops through an array and returns a new array with transformed elements. It does not modify the original array. forEach() The forEach() method loops through an array and executes a function on each element but does not return a new array Conclusion map() returns a new array with modified values. forEach() does not return an array, only executes a function. Use map() when you need transformed data. Use forEach() for side effects like logging or API calls.

Mar 2, 2025 - 09:18
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map() vs forEach() in JS

map()
The map() method loops through an array
and returns a new array with transformed
elements. It does not modify the original
array.

JS map()

forEach()
The forEach() method loops through an

array and executes a function on each

element but does not return a new array

JS forEach()

Conclusion

  • map() returns a new array with modified values.
  • forEach() does not return an array, only executes a function.
  • Use map() when you need transformed data.
  • Use forEach() for side effects like logging or API calls.
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