What are the differences between parseInt(x) and +(x) in Javascript

Question

By using parseInt(x), we can get an integer value from a string. But same functionality we can achieve from +(x) also. What exactly the functional difference are. Ex:

let input = '123';
let output = parseInt(input); // gives output as integer 123
let output = +(input); // gives output as integer 123

Answer 1

• The parseInt() function parses a string argument and returns an integer of the specified radix (the base in mathematical numeral systems)whereas the unary + acts more like parseFloat since it also accepts decimals.
• The parseFloat() function parses a string and returns a floating point number.
• Therefore if you are validating user input, unary plus has correct behavior for everything except it accepts decimals, whereas parseInt is too liberal.
• Here the String that you entered(ie, '123') does not have decimal point. So the output will be same.