string to number javascript

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

console.log(10+"1"); //101   both will be string
console.log(10-"1"); //9     string will be taken as number

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

parseInt(value);

let string = "321"
console.log(string); // "321" <= string

let number = parseInt(string);
console.log(number) // 321 <=int

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

 var a = parseInt("10");

 

let theInt = parseInt("5.90123"); //5
let theFloat = parseFloat("5.90123"); //5.90123

var text = '42px';
var integer = parseInt(text, 10);
// returns 42
let myNumber = Number("5.25"); //5.25

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

 var a = parseInt("10") + "<br>";
var b = parseInt("10.00") + "<br>";

 var c = parseInt("10.33") + "<br>";
var d = parseInt("34 45 66") + "<br>";

 var e = parseInt(" 60 ") + "<br>";
var f = parseInt("40 years") + "<br>";

 var g = parseInt("He was 40") + "<br>";

var h = parseInt("10", 10)+ "<br>";

 var i = parseInt("010")+ "<br>";
var j = parseInt("10", 8)+ "<br>";
var k = parseInt("0x10")+ "<br>";
var l = parseInt("10", 16)+ "<br>";


 var n = a + b + c + d + e + f + g + "<br>" + h + i + j + k +l;

 

let myNumber = Number("5.25"); //5.25

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