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Showing content from https://webplatform.github.io/docs/javascript/Array/reverse below:

reverse · WebPlatform Docs

reverse Summary

Reverses the elements in an Array.

Syntax

reverse()

Return Value

The reversed array.

Examples

The following example illustrates the use of the reverse method.

var arr = new Array(0,1,2,3,4);
 var reverseArr = arr.reverse();
 document.write(reverseArr);

Remarks

The required arrayObj reference is an Array object.

The reverse method reverses the elements of an Array object in place. It does not create a new Array object during execution.

If the array is not contiguous, the reverse method creates elements in the array that fill the gaps in the array. Each of these created elements has the value undefined.