var someArray = [ /* whatever */ ];
// ...
someArray.forEach(function(arrayElement) {
  // ... code code code for this one element
  someAsynchronousFunction(arrayElement, function() {
    arrayElement.doSomething();
  });
});

for (let i = 0; i < 3; i++) {
    funcs[i] = function() {
        console.log("My value: " + i);
    };
}

var funcs = [];

for (var i = 0; i < 3; i++) {
    funcs[i] = (function(index) {
        return function() {
            console.log("My value: " + index);
        };
    }(i));
}
for (var j = 0; j < 3; j++) {
    funcs[j]();
}

for (var i = 0; i < 3; i++) {

    (function(index) {
        console.log('iterator: ' + index);
        //now you can also loop an ajax call here
        //without losing track of the iterator value: $.ajax({});
    })(i);

}

var funcs = [];
for (let i = 0; i < 3; i++) {
    funcs[i] = function() {
      console.log("My value: " + i);
    };
}

var funcs = {};
for (var i = 0; i < 3; i++) {
    let index = i;          //add this
    funcs[i] = function() {
        console.log("My value: " + index); //change to the copy
    };
}
for (var j = 0; j < 3; j++) {
    funcs[j]();
}

for (var i = 0; i < 3; i++) {
    funcs[i] = (function() {
        var index = i;
        return function() {
            console.log("My value: " + index);
        }
    })();
}

function makeCounter()
{
  var obj = {counter: 0};
  return {
    inc: function(){obj.counter ++;},
    get: function(){return obj.counter;}
  };
}

counter1 = makeCounter();
counter2 = makeCounter();

counter1.inc();

alert(counter1.get()); // returns 1
alert(counter2.get()); // returns 0

var counters = [];

function makeCounters(num)
{
  for (var i = 0; i < num; i++)
  {
    var obj = {counter: 0};
    counters[i] = {
      inc: function(){obj.counter++;},
      get: function(){return obj.counter;}
    };
  }
}

makeCounters(2);

counters[0].inc();

alert(counters[0].get()); // returns 1
alert(counters[1].get()); // returns 1

function makeHelper(obj)
{
  return {
    inc: function(){obj.counter++;},
    get: function(){return obj.counter;}
  };
}

function makeCounters(num)
{
  for (var i = 0; i < num; i++)
  {
    var obj = {counter: 0};
    counters[i] = makeHelper(obj);
  }
}

var funcs = [];
for(var i =0; i<3; i++){
    funcs[i] = function(){
        alert(i);
    }
}

for(var j =0; j<3; j++){
    funcs[j]();
}

var funcs = [];
for(var new_i =0; new_i<3; new_i++){
    (function(i){
        funcs[i] = function(){
            alert(i);
        }
    })(new_i);
}

for(var j =0; j<3; j++){
    funcs[j]();
}

for (var i = 0; i < 3; i++) {
    createfunc(i)();
}

function createfunc(i) {
    return function(){console.log("My value: " + i);};
}

funcs[i] = function() {            // and store them in funcs
    throw new Error("test");
    console.log("My value: " + i); // each should log its value.
};

funcs[i] = new function() {
    var closedVariable = i;
    return function(){
        console.log("My value: " + closedVariable);
    };
};

var funcs = [];
[0,1,2].forEach(function(i) {          // let's create 3 functions
    funcs[i] = function() {            // and store them in funcs
        console.log("My value: " + i); // each should log its value.
    };
})
for (var j = 0; j < 3; j++) {
    funcs[j]();                        // and now let's run each one to see
}

My value: 0
My value: 1
My value: 2

funcs = {};
for (var i = 0; i < 3; i++) {
  funcs[i] = function inner() {        // function inner's scope contains nothing
    console.log("My value: " + i);
  };
}
console.log(window.i)                  // test value 'i', print 3

funcs = {};
function outer(i) {              // function outer's scope contains 'i'
  return function inner() {      // function inner, closure created
   console.log("My value: " + i);
  };
}
for (var i = 0; i < 3; i++) {
  funcs[i] = outer(i);
}
console.log(window.i)          // print 3 still

var funcs = [];
for (let i = 0; i < 3; i++) {          // let's create 3 functions
    funcs[i] = function() {            // and store them in funcs
        console.log("My value: " + i); // each should log its value.
    };
}
for (let j = 0; j < 3; j++) {
    funcs[j]();                        // and now let's run each one to see
}

[0,2,3].forEach(function(i){ console.log('My value:', i); });
// My value: 0
// My value: 2
// My value: 3

var funcs = [];
for (var i = 0; i < 3; i++) {          // let's create 3 functions
    funcs[i] = function() {            // and store them in funcs
        console.log("My value: " + i); // each should log its value.
    };
}
for (var j = 0; j < 3; j++) {
    funcs[j]();                        // and now let's run each one to see
}

var funcs = [];
for (var i = 0; i < 3; i++) {
    let index = i;
    funcs[i] = function() {
        console.log("My value: " + index);
    };
}
for (var j = 0; j < 3; j++) {
    funcs[j]();
}

var funcs = [];
function tempFunc(i){
    return function(){
        console.log("My value: " + i);
    };
}
for (var i = 0; i < 3; i++) {
    funcs[i] = tempFunc(i);
}
for (var j = 0; j < 3; j++) {
    funcs[j]();
}

<script>
   var funcs = [];
   for (var i = 0; i < 3; i++) {
     funcs[i] = function () {
        debugger;
        console.log("My value: " + i);
     };
   }
   console.log(funcs);
</script>

<script>
    var funcs = [];
    for (let i = 0; i < 3; i++) {
        funcs[i] = function () {
           debugger;
           console.log("My value: " + i);
        };
    }
    console.log(funcs);
</script>

var funcs = [];
for (var i = 0; i < 3; i++) {
  (funcs[i] = function() {
    console.log("My value: " + i);
  })(i);
}

var funcs = [];

new Array(3).fill(0).forEach(function (_, i) { // creating a range
    funcs[i] = function() {
        // now i is safely incapsulated
        console.log("My value: " + i);
    };
});

for (var j = 0; j < 3; j++) {
    funcs[j](); // 0, 1, 2
}

var funcs = [];
for (var i = 0; i < 3; i++) {      // let's create 3 functions
  funcs[i] = function(param) {          // and store them in funcs
    console.log("My value: " + param); // each should log its value.
  };
}
for (var j = 0; j < 3; j++) {
  funcs[j](j);                      // and now let's run each one to see with j
}

var funcs = Query.range(0,3).each(function(i){
     return  function() {
        console.log("My value: " + i);
    };
});

funcs.iterate(function(f){ f(); });

var funcs = [];
for (var i = 0; i < 3; i++) {      // let's create 3 functions
  funcs[i] = curryShowValue(i);
}
for (var j = 0; j < 3; j++) {
  funcs[j]();                      // and now let's run each one to see
}

function curryShowValue(i) {
  return function showValue() {
    console.log("My value: " + i);
  }
}

Create variable `funcs` and assign it an empty array;
Loop from 0 up until it is less than 3 and assign it to variable `i`;
    Push to variable `funcs` next function:
        // Only push (save), but don't execute
        **Write to console current value of variable `i`;**

// First loop has ended, i = 3;

Loop from 0 up until it is less than 3 and assign it to variable `j`;
    Call `j`-th function from variable `funcs`:
        **Write to console current value of variable `i`;**
        // Ask yourself NOW! What is the value of i?

var funcs = [];
for (var i = 0; i < 3; i++) {          // let's create 3 functions
    funcs[i] = function(x) {            // and store them in funcs
        console.log("My value: " + x); // each should log its value.
    }.bind(null, i);
}
for (var j = 0; j < 3; j++) {
    funcs[j]();                        // and now let's run each one to see
}