javascript write a custom slice function

Can anyone explain the inner workings of the array.slice method? I'm attempting to create a custom function that retrieves a portion of an array without relying on slice.

function customSlice(array, start, stop) {

for (let i = start; i <= stop; i++) {
return array[i];
}

Answer №1

Utilizing the slice method allows you to extract a designated portion of an array, starting from one point (begin) and ending at another point (end). To create your own slice function, consider this approach:

function customSlice(array, begin, end) {
  let slicedArray =[];

  if(end===undefined || end > array.length)
    end = array.length;

  for (let i = begin; i < end; i++) {
    slicedArray.push(array[i]);
  }
  return slicedArray;
}

mySlicedArray =customSlice([10,20,30,40],1,3);

In this example, we are extracting a slice from the array [10,20,30,40] starting at index 1 and ending at index 3, resulting in [20,30].

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