how to cast to int javascript code example

Example 1: how to convert string to int js

let string = "1";
let num = parseInt(string);
//num will equal 1 as a int

Example 2: Javascript string to int

var myInt = parseInt("10.256"); //10
var myFloat = parseFloat("10.256"); //10.256

Example 3: converst strig in number in js

const numberInString = "20"; 
console.log(typeof(numberInString)) // typeof is string this is string in double quote " "
const numInNum = parseInt(numberInString) // now numberInStrings variable converted in an Integer due to parseInt
console.log(typeof(numInNum)) // this tell us the type of numInNum which is now a number

Example 4: javascript type casting int

Number("3.14") // returns 3.14
false.toString()   // returns "false"
String(false)      // returns "false"

Example 5: string to number javascript

new Number(valeur);
var a = new Number('123'); // a === 123 donnera false
var b = Number('123'); // b === 123 donnera true
a instanceof Number; // donnera true
b instanceof Number; // donnera false