I used to get these mixed up all the time. Then I came up with a funny/simple saying.
"Use for...in if you want to be in trouble"
The most common use-case is to iterate over an array of things within an Array, where you'd want for...of, so using for...in would give you the "keys", or numbers which can create confusion.
You don't want to be "in" trouble, so don't use for...in. Hope that helps with remembering :D
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I used to get these mixed up all the time. Then I came up with a funny/simple saying.
"Use
for...inif you want to be in trouble"The most common use-case is to iterate over an array of things within an Array, where you'd want
for...of, so usingfor...inwould give you the "keys", or numbers which can create confusion.You don't want to be "in" trouble, so don't use
for...in. Hope that helps with remembering :D