declaration in 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 var
var a;
console.log(a); // scrive in console "undefined" o "" a seconda del browser usato.
console.log('still going...'); // scrive in console "still going...".
Example 3: javascript function declaration
//Four ways to declare a function
function add(a, b) {
return a + b;
}
var add = function(a, b) {
return a + b;
}
var add = (a, b) => {
return a + b;
}
var add = (a, b) => a + b;