Javascript-interview(Aug 2020)

/*
  1. shallow copying & depp copying
  2. use of 'use strict' with 'this' in javascript
  3. 
*/


// check it the given number is a number
function isNumber(val) {
  val = parseInt(val);
  if (typeof (val) == 'number') {
    console.log("number");
  } else {
    console.log("Not a number");
  }
}
isNumber('1')


// What wil be the output in console.log
var number = 1;
var object = { value: 1 }
function increaseN(number) {
  number = number + 1
}
function increaseO(object) {
  object.value++;
}
increaseN(number)
increaseO(object)
console.log(number);
console.log(object);


// What wil be the output in console.log
a = 'a';
b = 'b';
b = a;

function foo(a) {
  a = 'a-1';
}
foo(a);
console.log(a);


// write a function which will accept N number of arguments
add(1, 2);
add(1, 2, 3, 4, 4);

function add() {
  var abc = 0;
  for (let i = 0; i < arguments.length; i++) {
    abc = abc + arguments[i]
  }
  console.log(abc);
}


// What wil be the output in console.log
var where = "out";
function locate() {
  console.log("LOCATE", where);
  var where = "in";
};
locate();


// 1. Write a program to sort an object
// 2. Write a program to shuffle the array.
var a = [1, 2, 3, 4, 5, 6, 7, 8];
var b = [{ v: '3' }, { v: '2' }];

function random(arr) {
  var newVal = 0;
  var newObj = [];
  for (var i = 0; i < arr.length; i++) {
    console.log("arr", arr);
    if (newVal < arr[i][v]) {
      newObj.push({ v: arr[i][v] });
    } else {
      newObj.push({ v: arr[i][v] });
    }
  }
}
random(b);