javascript declare a variable
//choose the best for your solution
var myVariable = 22; //this can be a string or number. var is globally defined
let myVariable = 22; //this can be a string or number. let is block scoped
const myVariable = 22; //this can be a string or number. const is block scoped and can't be reassignedhow to change a variables value in javascript
var variable = 10;
function start() {
variable = 20;
}
console.log(variable + 20);
// Answer will be 40 since the variable was changed in the functionjs variable
var Number = 5;
var String = "Hi!";
var boolen1 = true;
var boolen2 = false;
var array = [11, "Hi!", true];
var object = {age:11, speach:"Hi!", likes_Bananas:true};js variables
//Making variables with let:
let numberOfFriends = 1;
//Incrementing:
numberOfFriends += 3; //numberOfFriends is now 4
// Variables with const
const minimumAge = 21; //CANNOT REASSIGN!
//Booleans - true or false values
true;
false;
let isHappy = true;
//Naming Conventions
// Use upper camel-cased names:
let numberOfChickens = 6; //GOOD
// NOT THE JS WAY:
// let number_of_chickens = 6;javascript variable
var user_name = prompt("Please enter your name:", "Type here");
alert("Hello " + user_name);javascript variables
// Also let, const
var e_number = 0;
var e_string = '';
var e_true = true;
var e_false = false;
var e_undefined = undefined;Copyright © 2021 Codeinu
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