11var isValidSudoku = function ( board ) {
2+ // create variable to store row , col and box values
23 let row = [ ]
34 let col = [ ]
45 let box = [ ]
6+ // loop i over 0-8
57 for ( let i = 0 ; i <= 8 ; i ++ ) {
8+ // loop j over 0-8
69 for ( let j = 0 ; j <= 8 ; j ++ ) {
10+ // this will help us get position of each cell from board
711 let IndI = 3 * Math . floor ( i / 3 ) + Math . floor ( j / 3 )
812 let IndJ = 3 * ( i % 3 ) + ( j % 3 )
13+ // check if value is already in row , col or box and return false
914 if ( row . indexOf ( board [ i ] [ j ] ) != - 1 ) { return false }
1015 if ( col . indexOf ( board [ j ] [ i ] ) != - 1 ) { return false }
1116 if ( box . indexOf ( board [ IndI ] [ IndJ ] ) != - 1 ) { return false }
12- 17+ // if not then add value to row , col and box
1318 if ( board [ i ] [ j ] != '.' ) { row . push ( board [ i ] [ j ] ) }
1419 if ( board [ j ] [ i ] != '.' ) { col . push ( board [ j ] [ i ] ) }
1520 if ( board [ IndI ] [ IndJ ] != '.' ) { box . push ( board [ IndI ] [ IndJ ] ) }
1621 }
22+ // reset row , col and box array
1723 row = [ ]
1824 col = [ ]
1925 box = [ ]
2026 }
2127
2228 return true
23- }
29+ }
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