variables en javascript code example
Example 1: 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 reassigned
Example 2: 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;
Example 3: javascript define variable
var variable1 = "some variable content";
Example 4: how to declare variables javascript
//variables are a way to easily store data in javascript
//variables are declared by the var keyword, example...
var x = 10;
//or
var dog_name = "daisy";
//which can also be written as
var dog_name = 'daisy';
//same thing with single quotes and double quotes
Example 5: javascript inicializar una variable
var a = 1;
b = 4;
delete this.a; // Lanza un error de tipo "ReferenceError" en modo estricto ('use strict'), de lo contrario falla silenciosamente.
delete this.b;
console.log(a, b); // Lanza un error de tipo "ReferenceError".
// La propiedad 'b' se eliminó y ya no existe.