Converting other data types to a number

Question 1

Using the Number() function:

Answer 1

let str = “42”;
let num = Number(str);
console.log(num); // outputs 42

Question 2

Using the parseInt() function:

Answer 2

let str = “42”;
let num = parseInt(str);
console.log(num); // outputs 42

Question 3

Using the parseFloat() function:

Answer 3

let str = “42.5”;
let num = parseFloat(str);
console.log(num); // outputs 42.5

Question 4

Using the unary plus operator +:

Answer 4

let str = “42”;
let num = +str;
console.log(num); // outputs 42

Question 5

to convert an object to a number:

Answer 5

let obj = { value: 42 };
let num = Number(obj.value);
console.log(num); // outputs 42