How to extend an existing JavaScript array with another array, without creating a new array

Question

There doesn\'t seem to be a way to extend an existing JavaScript array with another array, i.e. to emulate Python\'s extend method.

I want to achieve th

Answer 1

Use Array.extend instead of Array.push for > 150,000 records.

if (!Array.prototype.extend) {
  Array.prototype.extend = function(arr) {
    if (!Array.isArray(arr)) {
      return this;
    }

    for (let record of arr) {
      this.push(record);
    }

    return this;
  };
}