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// same worker function
function mapForEach(arr, fn) {
  var newArr = [];
  for (var i = 0; i < arr.length; i++) {
    newArr.push(
      fn(arr[i])
    );
  }
  return newArr;
}

var arr1 = [1,2,3];
// check to see if limiter is greater than the item
var checkLimit = function(limiter, item){
  return item > limiter; 
}
// binds checkLimit to mapForEach to see if 
// each array item is greater than the limiter above
// this sets the limiter to 1 
// bind will allow 2 args -- there's only 1 in fn(arr[i])
var arr4 = mapForEach(arr1, checkLimit.bind(this, 1));
console.log(arr4) // => [false, true, true]

// same worker function
function mapForEach(arr, fn) {
  var newArr = [];
  for (var i = 0; i < arr.length; i++) {
    newArr.push(
      fn(arr[i])
    );
  }
  return newArr;
}

var arr1 = [1,2,3];

// checks to see if limiter is greater
// but within a function expression to bind to mapForEach fn
var checkLimitSimple = function(limiter){
  return function(limiter, item){
    return item > limiter; 
  }.bind(this, limiter);
}

// this way limiter is already bound to newArr & we can just pass the limiter 
var arr5 = mapForEach(arr1, checkLimitSimple(1));
console.log(arr5);

function mapForEach(arr, fn) {
  // empty array as a temp container
  var newArr = [];
  for (var i = 0; i < arr.length; i++) {
    // add each item of arr1 to newArr
    newArr.push(
      fn(arr[i])
    );
  }
  return newArr;
}

var arr1 = [1,2,3];
console.log(arr1); // => [1,2,3]
// will take arr1 push it into newArr, map each item into newArr 
// and return each down here * 2
var arr2 = mapForEach(arr1, function(item){
  return item * 2;  
});
console.log(arr2); // => [2,4,6]

var arr3 = mapForEach(arr1, function(item){
  return item > 2; // true if > 2
});
console.log(arr3); // => [false, false, true]