how to string to number in 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 convert string to number or integer

//It accepts two arguments. 
//The first argument is the string to convert. 
//The second argument is called the radix. This is the base number used in mathematical systems. For our use, it should always be 10.


var text = '42px';
var integer = parseInt(text, 10);


// returns 42

Example 3: javascript string to integer

<script language="JavaScript" type="text/javascript"> 
var a = "3.3445";
var c = parseInt(a);
alert(c);
</script>

Example 4: 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