weird.js

// LOOOTS of stuff there: https://github.com/denysdovhan/wtfjs


// From https://www.destroyallsoftware.com/talks/wat
[] + []; // empty string
[] + {}; // [object Object]
{} + []; // 0
{} + {}; // NaN
Array(16); // ,,,,,,,,,,,,,,,, (array with 16 undefined elements)
Array(16).join('wat'); // watwatwatwatwatwatwatwatwatwatwatwatwatwatwatwat (array with 16 "wat" strings)
Array(16).join('wat' + 1); // wat1wat1wat1wat1wat1wat1wat1wat1wat1wat1wat1wat1wat1wat1wat1wat1
Array(16).join('wat' - 1) + " Batman!"; // NaNNaNNaNNaNNaNNaNNaNNaNNaNNaNNaNNaNNaNNaNNaNNaN Batman!
// Explanations here about the "why is this WAT?" => https://medium.com/dailyjs/the-why-behind-the-wat-an-explanation-of-javascripts-weird-type-system-83b92879a8db


// From https://blog.mgechev.com/2013/02/22/javascript-the-weird-parts/
1 * 'foo'; // NaN
1 * 2; // 2
'foo' * 1; // NaN
'foo' + 1; // 'foo1'
+!+[]; // 1
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// "Strange thing" (it's kinda JSFuck)

[]+(-~function(){}-~function(){}-~function(){}-~function(){}) + (-~function(){}-~function(){}); // "42"
[]+(-~{}-~{}-~{}-~{})+(-~{}-~{}); // "42" too
[[[['5']]]] * [[[[['5']]]]]; // 25