Apply method in javascript for functions

From a function we apply an object through the method apply obtaining a result according to the values that we have added of the object and a random value.

<script>
  var obj_basic = {obj1: 0.5, obj2: 0.8}; 
  var obj_new = function(client, val){ 
     return this[client]*val; 
  }
  console.log(obj_new.apply(obj_basic, ['obj1', 30])+' | '+obj_new.apply(obj_basic, ['obj2', 10]));//15
</script>

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