cast string to number js code example

Example 1: Javascript string to int

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

Example 2: string to number javascript

// Method - 1 ### parseInt() ###
var text = "42px";
var integer = parseInt(text, 10);
// returns 42

// Method - 2 ### parseFloat() ###
var text = "3.14someRandomStuff";
var pointNum = parseFloat(text);
// returns 3.14

// Method - 3 ### Number() ###
Number("123"); // returns 123
Number("12.3"); // returns 12.3
Number("3.14someRandomStuff"); // returns NaN
Number("42px"); // returns NaN

Example 3: string to int javascript

var text = '3.14someRandomStuff';
var pointNum = parseFloat(text);
// returns 3.14

Example 4: convert a string to number in javascript

var x = Number("1000")

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