Array slice()
In this chapter you will learn:
Array slice()
slice() returns the sub-array.
The slice() method may accept one or two arguments:
- the starting
- stopping positions.
slice(startingPoint) returns sub-array
between startingPoint and the end of the array.
slice(startingPoint,endPosition) returns
sub-array between the startingPosition and
endPosition, not including the item in the
end position.
slice() does not affect the original array in any way.
<!DOCTYPE html><!-- j a v a 2 s . com-->
<html>
<head>
<script type="text/javascript">
var colors = ["A", "B", "C", "D", "E"];
var colors2 = colors.slice(1);
var colors3 = colors.slice(1,4);
document.writeln(colors2); //B,C,D,E
document.writeln(colors3); //B,C,D
</script>
</head>
<body>
</body>
</html>
The code above generates the following result.
slice negative value
If either the start or end position of slice() is a negative number, then the number is subtracted from the length of the array.
For the array in the following code,
arrayWithFiveItem.slice(-2, -1)
is the same as arrayWithFiveItem.slice(3, 4).
<!DOCTYPE html><!-- ja v a2 s .c o m-->
<html>
<head>
<script type="text/javascript">
var colors = ["A", "B", "C", "D", "E"];
var colors2 = colors.slice(-2,-1);
var colors3 = colors.slice(3,4);
document.writeln(colors2); //D
document.writeln(colors3); //D
</script>
</head>
<body>
</body>
</html>
If the end position is smaller than the start, then an empty array is returned.
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What you will learn in the next chapter: