Is there a shorter way of doing this:
let arrSlicePush = arr.slice();
arrSlicePush.push(num);
let x = func(arrSlicePush);
Thanks in advance.
3 Answers
Simply do:
func([...arr, num]);
Worth noting that Array.push returns the length of the array anyway, so the first example is irrelevant.
Comments
You would call Array.prototype.concat instead of Array.prototype.push.
Also, since concat already merges two arrays and returns a new one, you so not even need to slice the original array.
const arr = [ 0, 1, 2, 3, 4 ];
const num = 5;
const func = (arr) => arr.map(e => String.fromCharCode(e + 65));
const x = func(arr.concat(num));
console.log(x);Notes
[ ...arr, val ] is syntactic sugar for arr.concat(val)
Comments
This works:
func(animals.slice().concat(num));
2 Comments
Nick Parsons
See this answer, you don't need to use
.slice() ;)
Ahmad MOUSSA
yeah, you are totaly right, but the question was to use both slice() & puch(), since push() cant not be used so I suggested the concat().... but we dont know if the person need to use slice() method for other reasons (slice(2), slice(2,1)...) ;)
let ArrSlicePush = Arr.slice(); ArrSlicePush.push(Num); let x = Func(ArrSlicePush);?.push()returns number of elements pushed+original length of array. So, you made a mistake. You didn't write it shorter.