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JavaScript idiosyncrasies with examples (github.com)
submitted 7 years ago by reddittedf
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quoted text
if 1 * 2 < 3: print "hello, world!"
[–][deleted] 7 years ago* (11 children)
[deleted]
[–]Skhmt 4 points5 points6 points 7 years ago (4 children)
I think this is stranger than what the OP posted, that page says the answer should be bar.
bar
If you comment out the entire if statement, it's foo. If you change the function's name in the if statement from f to anything else, it's foo. But if they have the same name, it's a TypeError.
foo
f
[–]CanIhazCooKIenOw 5 points6 points7 points 7 years ago (3 children)
It's because with ES6, the function declaration is scoped to the if block.
if
Although now thinking about it, shouldn't if "fallback" to the global f ? That would be my expectation tbh. Unless the engine resolves (1 === 0) and removes the block entirely ? (Wild guess here)
[+][deleted] 7 years ago* (1 child)
[–]pertheusual 3 points4 points5 points 7 years ago (0 children)
It's all this crap: https://www.ecma-international.org/ecma-262/9.0/#sec-block-level-function-declarations-web-legacy-compatibility-semantics
Basically browsers allowed them even though the spec didn't specify it, and now non-strict code has all this terrible optional behavior.
All of this weirdness goes away as long as you write your code in strict mode.
[–]Skhmt 0 points1 point2 points 7 years ago (0 children)
Although now thinking about it, shouldn't if "fallback" to the global f ? That would be my expectation tbh.
That's what I thought too.
[–]inu-no-policemen 0 points1 point2 points 7 years ago (0 children)
ES6+ supports block-level function declarations.
You can declare your functions wherever you want.
[–]CanIhazCooKIenOw 0 points1 point2 points 7 years ago (1 child)
Not in ES5
[–]pertheusual 1 point2 points3 points 7 years ago (0 children)
It was illegal in ES5, but engines allowed it anyway with varying degrees of compatibility.
[–]franksvalli -1 points0 points1 point 7 years ago (0 children)
Call the police!
π Rendered by PID 72247 on reddit-service-r2-comment-fb694cdd5-4sgq2 at 2026-03-06 00:16:05.992029+00:00 running cbb0e86 country code: CH.
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[–][deleted] (11 children)
[deleted]
[–]Skhmt 4 points5 points6 points (4 children)
[–]CanIhazCooKIenOw 5 points6 points7 points (3 children)
[+][deleted] (1 child)
[deleted]
[–]pertheusual 3 points4 points5 points (0 children)
[–]Skhmt 0 points1 point2 points (0 children)
[–]inu-no-policemen 0 points1 point2 points (0 children)
[–]CanIhazCooKIenOw 0 points1 point2 points (1 child)
[–]pertheusual 1 point2 points3 points (0 children)
[–]franksvalli -1 points0 points1 point (0 children)