Array Manipulation

JavaScript
1

I have an Array, I would like to add index number of each element after each element inside parentheses, for example milk (0) .

myArray=['milk', 'bread', 'eggs']
3

I want to replace the existing array.

5

I was trying to use

for (let i=0; i<myArray.length; i++){
myArray[i]=myArray[i]+'(??)'}

but I couldn’t think of how to put index number of each element into the place of ??.

6

The index is represented by the variable i, so why not concatenate between the ( and the )?

1 Like
7

Hey @LauraXiaoLiu,

note that replacing variable with new array and updating array in place has practically the same effect, so:

let arr = [1, 2, 3];
for (let i = 0; i < arr.length; i++) {
  arr[i] += i;
}
// Is pretty much the same as:
arr = arr.map((num, idx) => num + idx);

More on .map():

1 Like
9

But you will lose reference to the same amount of memory instantly. On fairly small array difference would be microsecond at most :slight_smile:

1 Like