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javascriptarraysfor-loopfor-of-loop

Make for...of to skip from looping the last element

In case that there is a bi-dimensional array which is iterated using for...of, how is the best way to skip the last element?

For example, having an array arr, the normal approach would be:

for(const subArray of arr) { ... }

to skip the last element it could be used before the loop: arr.slice(0, -1); which works fine but it removes that data which should be avoided.

Is there a way to make it skip the last element without losing data?

Solution

  • slice() does not change the array, but returns a new array (unlike splice(), which does mutate the array), therefore it is safe to use:

    for (const subArray of arr.slice(0, -1)) { ... }