lior-amsalem’s gists

lior-amsalem / calculator.js

Created October 17, 2021 18:41

Create a simple calculator that given a string of operators (), +, -, *, / and numbers separated by spaces returns the value of that expression. see example below

	/**
	Example:

	Calculator().evaluate("2 / 2 + 3 * 4 - 6") # => 7
	**/

	const Calculator = function() {
	this.resolveMultiDivision = mathString => {
	var resolvedTop = mathString.replace(new RegExp(/(\d\.?\d)([\/\])(\d\.?\d*)/), (match, group1,group2,group3) => {
	return group2 === '' ? group1 group3 : group1 / group3;

lior-amsalem / sudoku-resolve-function.js

Created October 17, 2021 18:40

Sudoku is a game played on a 9x9 grid. The goal of the game is to fill all cells of the grid with digits from 1 to 9, so that each column, each row, and each of the nine 3x3 sub-grids (also known as blocks) contain all of the digits from 1 to 9.

	/**
	example:
	validSolution([
	[5, 3, 4, 6, 7, 8, 9, 1, 2],
	[6, 7, 2, 1, 9, 5, 3, 4, 8],
	[1, 9, 8, 3, 4, 2, 5, 6, 7],
	[8, 5, 9, 7, 6, 1, 4, 2, 3],
	[4, 2, 6, 8, 5, 3, 7, 9, 1],
	[7, 1, 3, 9, 2, 4, 8, 5, 6],
	[9, 6, 1, 5, 3, 7, 2, 8, 4],

lior-amsalem / connect-four-who-won-function.js

Created October 17, 2021 18:38

Connect Four is a game in which two players take turns dropping red or yellow colored discs into a vertically suspended 7 x 6 grid. Discs fall to the bottom of the grid, occupying the next available space. in this function we'll resolve if the game is done/won given array

	/**
	array of game for example:

	[['-','-','-','-','-','-','-'],
	['-','-','-','-','-','-','-'],
	['-','-','-','R','R','R','R'],
	['-','-','-','Y','Y','R','Y'],
	['-','-','-','Y','R','Y','Y'],
	['-','-','Y','Y','R','R','R']];
	**/

lior-amsalem / make-spiral.js

Created October 17, 2021 18:37

Function purpose is to create a NxN spiral with a given size

	/**
	output of size = 5 example:

	00000
	....0
	000.0
	0...0
	00000
	**/

lior-amsalem / smaller-than-me.js

Created October 17, 2021 18:35

given array of numbers, return array of numbers that tells how many numbers to the right are smaller than current value

	function smaller(nums) {
	/** developer comment:
	- we have to return the amount of numbers that are smaller than arr[i] to the right.
	- example: smaller([5, 4, 3, 2, 1]) === [4, 3, 2, 1, 0] or smaller([1, 2, 0]) === [1, 1, 0]
	- go over each elemt
	- cut with slice base on current index
	- filter which one is smaller then current value
	- use lenght to count how smaller than me?
	**/
	let res = nums.map((value, index, array) => {

lior-amsalem / remove-odd-index-elem-from-array.js

Created October 17, 2021 18:32

Simply remove every odd index element in array

	function removeEveryOther(arr){
	return arr.filter((word, index) => !(index%2));
	}

lior-amsalem / calculate-with-function-names.js

Created October 17, 2021 18:30

we want to write calculations using functions and get the results. example: seven(times(five())); // must return 35

	/**
	Developer comments
	- we want to write calculations using functions and get the results. example: seven(times(five())); // must return 35
	- use return to understand the structure those functinos are being called
	- use array to pass and store all previous data of those functions
	- build single function to resolve the array we build
	**/
	function resolve(a) {
	if(a.length >= 3) {
	if(a[1] === '*') {

lior-amsalem / encrypt-decrypt.js

Created October 17, 2021 18:29

	/**
	Developer comment
	- This is a pseudo-encryption algorithm which given a string S and an integer N concatenates all the odd-indexed
	characters of S with all the even-indexed characters of S, this process should be repeated N times.
	- use recursive function
	- decress the N
	- every step encrypt the text
	- make sure we have exist statement, than return the text
	**/
	function encrypt(text, n) {

lior-amsalem / array-diff.js

Created October 17, 2021 18:26

	/**
	Developer comment
	- This is a difference function, which subtracts one list from another and returns the result.
	- we'll go over all 'b' values
	- we'll use filter to knock down each of 'b' values from 'a' array
	**/

	function arrayDiff(a, b) {
	let newArray = a;

lior-amsalem / get-domain-name-from-url.js

Last active October 17, 2021 18:25

Get domain name from a URL

	/**
	Developer comment
	- we'll use regex to build few capturing groups with the next structure:
	first: https://wwww
	second: <the domain>
	thrid: .<end of domain>
	- than we pick the relevant group from the array (base on the code task requriement)
	**/
	function domainName(url){
	return url.match(/^(https?:\/\/)?([w]+\.)?([a-z0-9-]+)\.[a-z]+/)[3];

Lior Amsalem lior-amsalem