NODEJS Count all array number [closed] - javascript

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I wanna get number of total array in NodeJS. Any way can do this?
For example: In picture have array from 0 > 558. Then I want a function to give the count is 559
Thank you.
Hieu

The array is only broken in console since it is very long: (i.e: if the length of array is longer than 100 then the console will break it to show it clearly..). if u logged the length then it will show 559, just do arr.length

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Given an array of integers, find the one that appears an odd number of times [closed]

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There will always be only one integer that appears an odd number of times.

How to count specific items in array [closed]

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I've got this array in my jquery Script :
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what does line of code mean: inputArray[0] [closed]

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I am trying to understand what it means when a code appears in between the brackets. I know that has something to do with an array.
In the case of "inputArray[0]", it is finding the value at index position 0 (the first element) in the array "inputArray".

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I saw this in someones code and i'm trying to understand what it means
if(output=="" && history!=""){
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