JavaScript Brain Teasers

Puzzle 19

Hexorcism

hexorcism/Hexorcism.js

const hex = "0x1E";

console.log(hex - 0);

Guess the Output
	Try to guess what the output is before moving to the next page.

You might have anticipated that the output would be NaN since “0x1E” is a string, but this code will actually output:

30

Discussion

This JavaScript code outputs 30 because of the way JavaScript handles arithmetic operations and type conversions. The "0x" part is a prefix used ...