array.reduceRight()
The array.reduceRight() is an inbuilt function in JavaScript which is used to convert elements of the given array from right to left to a single value.It accepts 2 parameters( current value and previous value ) from the given array and executes the operation.In the following example all the elements(group of arrays) were converted in to a single group (9,10,x,y,z,1,2,3) from right to left, when reduceRight() method is applied.
Example
<html> <body> <script> const Arr = [ [ 1, 2, 3 ], [ "x", "y", "z" ], [ 9, 10 ] ]; array = Arr.reduceRight((previousValue, currentValue) => previousValue.concat(currentValue)); document.write(array); </script> </body> </html>
output
9,10,x,y,z,1,2,3