Javascript is most popular scripting language and it is always in first row of stackoverflow tags page.
So why we should not use javascript to implement algorithms. Generally in coding interview, you will have freedom to write algorithms in your favorite language. If you are good at Javascript, then why to go with other languages.

Lets implement some algorithm stuff with JS. The below topics were covered in this article

1) String/Array, 2) Linked List, 3) Tree, 4) Heap, 5) Graph, 6) Sorting, 7) Recursion vs. Iteration,
8) Dynamic Programming, 9) Bit Manipulation, 10) Probability, 11) Combinations and Permutations

Debugging JS

to print content in console, we have to use below statement
console.log('hello world');
Use chrome or firefox to debug Javascript. Just "right click" > "inspect element" > "click on console".
Then you will see console.

Some useful operations in Javascript

To get char array from string

"Hello world!".split('')
["H", "e", "l", "l", "o", " ", "w", "o", "r", "l", "d", "!"]

Get char from index

var str = "HELLO WORLD";
var res = str.charAt(0); // 'H'

Get length of string

var str = "HELLO WORLD";
var res = str.length; // 11

Get length of array

var sarr = ["H","E"];
var res = sarr.length; // 2

Substring

var str = "HELLO WORLD";
var res = str.substring(1); // "ELLO WORLD"
var res = str.substring(1,4); //"ELL"

Sort array

var nums= [4,2,3,1];
nums.sort(); // 1,2,3,4

Convert string to int

var num = parseInt("10");

Convert array to string

var sarr = ["H","E"];
var res = sarr.join(''); // HE

Slice and copy array

var nums= [4,2,3,1];
var newArr = nums.slice(); // copy array
var newArr = nums.slice(1,3); // 2, 3

Reverse the array

var nums = [1, 2, 3, 4];
nums.reverse(); // [3, 4, 2, 1]

Remove Item From Array At Specific Index

var num = [1,2,3,4]; // array
var j = 2; // index value
num.splice(j,1); // removing 3 from the array

Add Item To Array At Specific Index

var num = [1,2,3,4]; // array
var j = 2; // index value
num.splice(j,0,5); // Add 5 at index 2

Verify if variable is not a number

var str = "sample";
isNaN(str) // true
var num = 9;
isNaN(num) // false

Iterate characters

for (var c = 'a'; c <= 'z'; c = nextChar(c)) {
........
}

function nextChar(c) {
return String.fromCharCode(c.charCodeAt(0) + 1);
}

Map (key - value pair) implementation

// put value in map
var map = {};
map['mykey'] = 'myvalue';

// check whether map contains key
if(map['mykey'] != null) {
// map contains key
}

// get value to the key
var value = map['mykey'];

// a method for getting key of a target value
function getKey(map, target){
for (var i in map)     {
if (map[i] == target) {
return i;
}
}
return null;
}

// delete the key-value pair
delete map[key];

Stack Implementation

var stack = [];
//push value into stack
stack.push(1);
//pop value from stack
stack.pop(1);

Queue Implementation

var queue = [];
//push value into queue
queue.push(2);         // queue is now [2]
queue.push(5);         // queue is now [2, 5]
//pop value from queue
var i = queue.shift(); // queue is now [5]

Classic Problems (String / Array)

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