Currently, am looping through an Array with the following code:
{allThrows.map((handThrow, index) => {
But this starts with index=0; how can I start and work down to 0 from allThrows.length-1 as the first element and decrement by 1 from there?
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Here you go stackoverflow.com/questions/32682962/…TR3– TR32021-09-03 15:38:34 +00:00Commented Sep 3, 2021 at 15:38
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Does this answer your question? Javascript - Loop through array backwards with forEachprakash sellathurai– prakash sellathurai2021-09-03 15:39:01 +00:00Commented Sep 3, 2021 at 15:39
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Use a for loop.iunfixit– iunfixit2021-09-03 15:39:18 +00:00Commented Sep 3, 2021 at 15:39
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@TR3 it is one way, I found the below answer with reverse() helpful and cleaner given I am already using map.satchel– satchel2021-09-04 17:52:29 +00:00Commented Sep 4, 2021 at 17:52
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2 Answers
there's 2 way:
-reverse()
you can reverse your array first then loop through it by allThrows.reverse().map(), and have in mind, this will reverse the original array. you can store it in a new variable first.
-reduceRight()
this method applies a function on currentValue and send the result (accumulator) to next step, backwards.
but you can ignore the passed result and use only currentValue.
like this:
allThrows.reduceRight((accumulator,currentValue)=>{
console.log(currentValue)
return null
})
Comments
try :
[...allThrows].reverse().map((handThrow, index) => { //do something in reverse }
if you don't care about the index but just about mapping the array items in reverse
