I'd better keep apart semantics and tinkering with lang:
JS:
0 in [1,2,3] === true 1 in [1,2,3] === true // Wrong usage because JS expects Object
Python:
(0 in [1,2,3]) == False (1 in [1,2,3]) == True
But, JS:
'1' in {'1': null} === true // correct
and Python:
(1 in {1: None}) == True
Thus historically JS is much more ad-hoc with all the consequences.
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I'd better keep apart semantics and tinkering with lang:
JS:
Python:
But, JS:
and Python:
Thus historically JS is much more ad-hoc with all the consequences.