Answers for "javascript int cast"

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

JS cast a string into a Number

const input = "42";
const number = Number.parseInt(input, 10);

string to number javascript

let str = "390";
let num = +str;
console.log(num); // will give us int 390