Javascript call method for functions

We create a function that performs multiplications. With the function 'call' we make a call to an object that is applied to this function where it operates with its elements.

<script>
  var obj_basic = {obj1: 0.5, obj2: 0.8}; 
  var obj_new = function(client, val){ 
     return this[client]*val; 
  } 
  console.log(obj_new.call(obj_basic, 'obj1', 10)); // 0.5*10=5 
  console.log(obj_new.call(obj_basic, 'obj2', 20));//0.8*20=16
</script>

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