I am facing an issue with using the forEach method on an array. Despite it being a mutator, it is not mutating the values in the original array as expected. Can anyone help me figure out what could be causing this problem?
let array = [1, 2, 3, 4]; //declaring a simple array
array.forEach((ele) => ele * 2); //using forEach to double each element in "array"
console.log(array); //expecting [1, 4, 6, 8] but getting [1, 2, 3, 4] insteadAny insights on why this is happening?
Contrary to popular belief, forEach does not actually alter the original array.
To achieve the desired outcome, you can specify a second parameter as index and then update the values of the original array accordingly.
let numbers = [1, 2, 3, 4];
numbers.forEach((element, index) => numbers[index] = element * 2);
console.log(numbers);For more information on using forEach, refer to the documentation.
Array#forEach method allows you to utilize the second and third optional parameters for accessing and modifying each element:
index [Optional]: Specifies the index of an element in the array.
array [Optional]: Refers to the array on which forEach() is invoked.
const array = [1, 2, 3, 4];
array.forEach((_, index, arr) => arr[index] *= 2);
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