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

shift Summary

Removes the first element from an array and returns it.

Syntax

shift( )

Return Value

Returns the element removed from the array.

Examples

The following example illustrates the use of the shift method.

var arr = new Array(10, 11, 12);
 while (arr.length > 0)
     {
     var i = arr.shift();
     document.write (i.toString() + " ");
     }