peeters on You Can't JavaScript Under Pressure

Comment on You Can't JavaScript Under Pressure

Fun distraction. For me it was:

30% figuring out the answer, 20% not having my editor shortcuts available, 50% figuring out how to check if a value is a certain type.

Am I the only one that gives their functions preconditions that the input is good? To me, throwing up when you're passed a non-number to a sum method is correct behavior.

dclowd9901 12y

TIL there is no typeof === 'array'. -_-

rhengles 12y

    [] instanceof Array; // returns true

bentruyman 12y

However this fails on "Array-like" objects like NodeLists.

dclowd9901 12y

Clever...

ep103 12y

Array.isArray(yourVariable), yeah, had to mdn that one too.

hayksaakian 12y

typeof(["an array", "contains multiple things"]) == typeof(["sometimes"])

iclelland 12y

Yes, but:

    typeof(["an array", "contains multiple things"]) == typeof({but_this_one: "is an object"})

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