matrix_mulipication.js

(function(){ 

   function multiply(first, second,r1,c1,r2,c2){
    if(c1!=r2){
        console.log("Cannot multiple");
        return;
    }
    let sum = 0;
    let output=[[],[],[]];
    for(let i=0; i<r1; i++){
        for(let j=0; j<c2; j++){ //column
            for(let k =0; k<r2; k++){
                sum= sum + first[i][k] * second[k][j]

            }
            output[i][j]=sum;
        }
    }
    return output;

   } 


   let matrix1=[[1,2,3,4],[3,5,4,1],[1,1,1,1]];
   let matrix2=[[1,1],[2,2],[3,3],[4,4]];
   let row_first =3; col_first =4;
   let row_second =4 ; col_second =2;
   console.log(multiply(matrix1,matrix2,row_first,col_first,row_second,col_second))
})();