
Created 2025-09-25
/** * ============================================================================ * = What the f*ck JavaScript? = * ============================================================================ * * JavaScript is a powerful language, flexible syntax and a large ecosystem * with a great community. However, it also has some quirks and unexpected * behaviors that can be dangerous but funny. * * Here are some of the examples from https://github.com/denysdovhan/wtfjs. */ //➜ true echo([] == ![]); // https://github.com/denysdovhan/wtfjs?tab=readme-ov-file#-is-equal- //➜ false echo(0.1 + 0.2 === 0.3); // https://github.com/denysdovhan/wtfjs?tab=readme-ov-file#precision-of-01--02 //➜ "baNaNa" echo("b" + "a" + +"a" + "a"); // https://github.com/denysdovhan/wtfjs?tab=readme-ov-file#banana //➜ "fail" echo( (![] + [])[+[]] + (![] + [])[+!+[]] + ([![]] + [][[]])[+!+[] + [+[]]] + (![] + [])[!+[] + !+[]] ) // https://github.com/denysdovhan/wtfjs?tab=readme-ov-file#its-a-fail //➜ 15 echo(parseInt("f*ck", 16)); // https://github.com/denysdovhan/wtfjs?tab=readme-ov-file#parseint-is-a-bad-guy //➜ "1,2,34,5,6" echo([1, 2, 3] + [4, 5, 6]); // https://github.com/denysdovhan/wtfjs?tab=readme-ov-file#adding-arrays //➜ "first" foo: { echo("first"); break foo; echo("second"); } // https://github.com/denysdovhan/wtfjs?tab=readme-ov-file#labels //➜ 1 //➜ 2 //➜ 3 //➜ 4 //➜ 5 a: b: c: d: e: f: g: echo(1), echo(2), echo(3), echo(4), echo(5); // https://github.com/denysdovhan/wtfjs?tab=readme-ov-file#labels //➜ [ 1, 10, 3 ] echo([10, 1, 3].sort()); // https://github.com/denysdovhan/wtfjs?tab=readme-ov-file#default-behavior-arrayprototypesort