Hey all!
Recently, I've been studying loops in JavaScript and was wondering if more experienced developers could give some examples of when to best use each of them. For example, when should I use a for loop vs. a while loop or vice versa?
Thanks!
Will
Posted on
How do you know when to use different types of loops? (i.e. for...of vs. for vs. while)
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Top comments (3)
The way I've always decided is that
forloops are for "known" lengths andwhileloops are for "unknown" lengths.To break this down further - if you have an array and need to loop over each element of the array, you can use
for (item of array). We know it's going to be a for loop because we want to hit each element 1 time over the course of our loop.If we wanted to add items to an array until the length of the array was 100 or more items, we could use
while (array.length < 100)- the big thing here is that we don't know how long our array will be when it starts.Does that clarify things?
It does, thanks so much!
For simple iterations over arrays for...of is concise while for offers more control over looping conditions. While is handy for indefinite loops where the exit condition isnt initially known.
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