Array Method Synonyms

synonyms.js

// For learning purposes only! 
// Don't pollute the Array prototype in an application

// map synonym
Array.prototype.transform = function(callback) {
  const newArr = [];
  for(let i = 0; i < this.length; i++) {
    newArr.push(callback(this[i]));
  }
  return newArr;
}

// filter synonym
Array.prototype.takeOnly = function(callback) {
  const newArr = [];
  for(let i = 0; i < this.length; i++) {
    if(callback(this[i])) {
      newArr.push(this[i]);
    }
  }
  return newArr;
}

// reduce synonym
Array.prototype.aggregate = function(callback, initalValue) {
  let accumulator = initalValue;
  for(let i = 0; i < this.length; i++) {
    const el = this[i];
    accumulator = callback(accumulator, el);
  }
  return accumulator;
}