JAVASCRIPT

Converting strings to numbers

parseInt('101', 2) // 5

string to number

Number('123'); // returns 123

convert a string to number in javascript

var x = Number("1000")

convert a string to number in javascript

var x = parseInt("1000", 10); // you want to use radix 10
    // so you get a decimal number even with a leading 0 and an old browser ([IE8, Firefox 20, Chrome 22 and older][1])

convert string to number

// Convert string to number in Javascript. 
// If the quantity cannot be converted the result will be NAN
const quantity = +quantity