Javascript version of list.pop-CodePudding

I am trying to create a javascript version of python's pop function.

Here is what I have so far:

function pop(arr, idx) {
  arr = arr.splice(0, idx).concat(arr.splice(idx   1));
  console.log(arr);
}

I am not sure of why it is only returning the first part and not combining with the second.

CodePudding user response：

are you looking for something like this? maybe you can modify it so that the pop function returns the removed element.

const arr1 =  [10,20,30,40,50,60];
const arr2 =  [10,20,30,40,50,60];
const arr3 =  [10,20,30,40,50,60];

function pop(arr, idx) {
    removedEl = arr.splice(idx,1)[0];
  console.log('removed element: ',removedEl)
  console.log('final array: ',arr);
}

pop(arr1,0);
pop(arr2,2);
pop(arr3,5)

CodePudding user response：

Array.splice() modifies the array. It doesn't create a new array. All you need is this:

const pythonPop = ( arr , i = -1 ) => arr.splice(i,1)[0];