// MapReduce.js // Name: map // Purpose: Perform a given operation on every element in an array. // Args: // func - the function that implements the desired behaviour for any given array element // arr - the array containing the elements to be processed function map(func, arr) { for (i = 0; i < arr.length; i++) { func(arr[i]); } } // Name: reduce // Purpose: Combine all the elements in an array into a single value using a given operation. // Args: // func - the function that implements the desired behaviour for combining array elements // arr - the array containing the elements to be processed function reduce(func, arr, initVal) { var s = initVal; // This will determine the type of s at runtime for (i = 0; i < arr.length; i++) { s = func(s, arr[i]); } return s; }
"MapReduce in JavaScript"
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