colevandersWands

Function declaration & Function expression

Q1

console.log(square(5));
function square(n) {
return n*n;
}

• Error
• 25

colevandersWands

Primitive Types & Reference Types in JavaScript

An explanation of JavaScript's pass-by-value, which is unlike pass-by-reference from other languages.

Facts

• JavaScript has 2 kinds of variable types: primitive and reference.
• A fixed amount of memory is reserved after creation of every variable.
• When a variable is copied, it's in-memory value is copied.
• Passing a variable to a function via a call also creates a copy of that variable.

Primitive Types

colevandersWands

const bottleManagement = {
    bottles: {},
    nextId: 0,
    addBottle: function (newBottle){
        newBottle.key = this.nextId
        this.bottles[this.nextId] = newBottle; 
        this.nextId++;
        return this.nextID - 1;
    },
    getBottle: function(id){

colevandersWands

var app = {
    db: {},
    next_id: 0,
    create: function(newThing) {
        // this.db[this.next_id] = newThing;
        // this.next_id ++;
        if(newThing !== ''){
        	this.db[this.next_id] = newThing;
        	this.next_id ++;
        	console.log("THING WAS ADDED")

colevandersWands

function challenge1 (a, b, c){
    let base1 = Number.parseInt(a, b);
    let base2 = Number.parseInt(base1, c);
    return base2.toString();
}

console.log(challenge1 (10, 2, 10))

colevandersWands

function tripledouble(num1, num2) {
    var check1 = '';
    var check2 = '';
    if (typeof num1 !== 'number' || typeof num2 !== 'number'){
        return 0;
    }
    var a =  num1.toString().split('');
    var b =  num2.toString().split('');

    for (var i = 0; i < a.length; i++){