Javascript Map calculation of a multiplication from an array

We create a function of 4 values, the first three values create an array or set of values, then we calculate the product of each of the values by another value that we have defined in the fourth element of the function.

<script>
  function showMap(x,y,z,val){ 
     var mult = [x, y, z].map( (el) => el*val ); 
     for(let key in mult){ 
         console.log(key + ' => ' + mult[key]); 
     } 
  }
  showMap(2,3,4,2);
</script>

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