remove array value after index

 

This question already has an answer here:

  • How do I remove a particular element from an array in JavaScript? 63 answers

    • You need to use slice(0,3) to slice out between indexes 0 and 3, obtaining indexes 0,1,2. That's [5,10,15] .

    You seem to just want to truncate the array. The simplest way is to set its length : 

    array.length = 3;

    If you were doing that based on an index (say, index = 2 ), you'd add one to get the length, as arrays are 0-based: 

    array.length = index + 1;

    If you want to get a copy a subset of elements as a new array, you would indeed use slice : 

    var new_array = array.slice(0, 3);

    Live example of truncation: 

    var array = [5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60];
snippet.log("Before: " + array.join(", "));
array.length = 3;
snippet.log("After: " + array.join(", "));
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