How To Use Break Statement In An Array Method Such As Filter?

I was trying to solve an algorithm challenge which required; Drop the elements of an array (first argument), starting from the front, until the predicate (second argument) retu

Solution 1:

You can just use for loop and when function returns true you can just break loop and return results from that index.

var arr = [1, 2, 3, 4, 5, 6, 7, 8];

functiondrop(data, func) {
  var result = [];
  for (var i = 0; i < data.length; i++) {
    var check = func(data[i]);
    if (check) {
      result = data.slice(i);
      break;
    }
  }
  return result;
}

var result = drop(arr, e => e == 4)

console.log(result)

You can also use findIndex() and if match is found you can slice array from that index otherwise return empty array.

var arr = [1, 2, 3 ,4 ,5 ,6 ,7, 8];

var index = arr.findIndex(e => e == 4)
var result = index != -1 ? arr.slice(index) : []

console.log(result)