FE Test

01_closure.js

(function() {
  console.log(abc);
  
  var abc = "abc";
  
  console.log(myFunc());
  
  function myFunc() {
    var def = abc + 'def';
    
    return def;
  }
})();

02_loop.js

function loop() {
  for (var i = 0; i < 5; i++) {
    setTimeout(function() {
      console.log(i);
    }, i * 1000);
  }
}

loop();

03_stack.js

(function() {
    console.log(1); 
    
    setTimeout(function() {
      console.log(2);
    }, 1000);
    
    setTimeout(function() {
      console.log(3);
    }, 0); 
    
    console.log(4);
})();

04_arrays.js

// Array.prototype.map
var persons = [
  {
    id: 1,
    name: "John Smith",
  },
  {
    id: 2,
    name: "Sam Nilson",
  },
  ...
];

function getNames(persons) {
  ...
}

console.log(getNames(persons));

// [{
//   id: 1,
//   firstName: "John",
//   lastName: "Smith"
// }, ...]

// Array.prototype.filter & Array.prototype.every
var numbers = [2, 4, 6, 7, 8, 10, 13];

function getOddNumbers(numbers) { // нечетные
  ...
}

var oddNumbers = getOddNumbers(numbers); // array

function isAllNotBiggerThan100(numbers) {
  ...
}

var isNotBiggerThan100 = isAllNotBiggerThan100(numbers); // boolean

05_context.js

function func() {
  this.name = "John";
}

var a = func(); // a? this?
var b = new func(); // b? this?

var c = {
  name: "Sam", // writable: false
  sayName: function () {
    console.log(this.name);
  }
}

var d = ...;

d(); // => "John"