JS Array Slice & Splice

Array slice()

The slice() method returns selected elements in an array, as a new array.

The slice() method selects from a given start, up to a (not inclusive) given end.

The slice() method does not change the original array.

Syntax

array.slice(start, end)

Parameters

Parameter	Description
start	Optional. Start position. Default is 0. Negative numbers select from the end of the array.
end	Optional. End position. Default is last element. Negative numbers select from the end of the array.

<!DOCTYPE html>
<html>
<head>
  <title>JavaScript</title>
  <script>
    var a = ["Sanjay", "Aman", "Rehman","Rahul", "Karan"];
    document.write(a + "<br><br>");
    var b = a.slice(1 , 4);
    document.write(b);
  </script>
</head>
<body>

</body>
</html>

Array splice()

The splice() method adds and/or removes array elements.

The splice() method overwrites the original array.

Syntax

array.splice(index, howmany, item1, ....., itemX)

Parameters

Parameter	Description
index	Required. The position to add/remove items. Negative value defines the position from the end of the array.
howmany	Optional. Number of items to be removed.
item1, ..., itemX	Optional. New elements(s) to be added.

<!DOCTYPE html>
<html>
<head>
  <title>JavaScript</title>
  <script>
    var a = ["Sanjay", "Aman", "Rehman", "Rahul"];
    document.write(a + "<br><br>");
    a.splice(2,0,"Neha","Karan");
    document.write(a);
  </script>
</head>
<body>

</body>
</html>