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Reduce

methods

Executes a callback function for every single item in the array and returns the accumulated result. Iterates the items left to right.

reduce

Parameters:callbackFunction

The function that will be executed for every item.

Returns:Number

—The accumulated result.

 <script>
  var arr = new kendo.data.ObservableArray([100, 10, 20, 30]); 
  
  var result = arr.reduce((totalCount, item) => totalCount - item)
  /* The result can be observed in the DevTools(F12) console of the browser. */
  console.log(arr)
  console.log(result)
</script>