Move all zeroes to end of array | Function which pushes all zeros to end of an array . ; Count of non - zero elements ; Traverse the array . If element encountered is non - zero , then replace the element at index ' count ' with this element ; here count is ; incremented Now all non - zero elements have been shifted to front and ' count ' is set as index of first 0. Make all elements 0 from count to end . ; Driver code
function pushZerosToEnd ( arr , n ) { let count = 0 ; for ( let i = 0 ; i < n ; i ++ ) if ( arr [ i ] != 0 ) arr [ count ++ ] = arr [ i ] ; while ( count < n ) arr [ count ++ ] = 0 ; } let arr = [ 1 , 9 , 8 , 4 , 0 , 0 , 2 , 7 , 0 , 6 , 0 , 9 ] ; let n = arr . length ; pushZerosToEnd ( arr , n ) ; document . write ( " " ) ; for ( let i = 0 ; i < n ; i ++ ) document . write ( arr [ i ] + " " ) ;