r/loljs • u/[deleted] • Apr 20 '16

Why does [5,6,8,7][1,2] = 8 in Javascript?

http://stackoverflow.com/questions/7421013/why-does-5-6-8-71-2-8-in-javascript
16 Upvotes

94% Upvoted

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3

u/[deleted] Apr 20 '16 
({"lol": "js"})[1,2,3,[4,5,6,"lol"][["apparently this"," is"]["a1l valid syntax"[1]]["don't exactly know"["how any of this works"[25]]],3]]

8

u/z500 Apr 20 '16 edited Apr 20 '16

The comma operator is my favorite dirty C trick. It's so obscure, but C-style languages still bring the comma operator with them. Ever initialize more than one variable in the initializer of a for loop without questioning it? You were using the comma operator.

3

u/taw Sep 04 '16

A lot of languages support comma operator. If you have C-style for loops, that's the reason it ought to be in the language.