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Update solution for basic recursion #176

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Update solution for basic recursion #176

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7 changes: 3 additions & 4 deletions exercises/basic_recursion/solution/solution.js
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Original file line number Diff line number Diff line change
@@ -1,8 +1,7 @@
function reduce(arr, fn, initial) {
return (function reduceOne(index, value) {
if (index > arr.length - 1) return value // end condition
return reduceOne(index + 1, fn(value, arr[index], index, arr)) // calculate & pass values to next step
})(0, initial) // IIFE. kick off recursion with initial values
if (arr.length === 0) return initial // end condition
var subset = arr.slice(0, arr.length - 1) // setup recursive call with left subset
return fn(reduce(subset, fn, initial), arr[arr.length - 1]) // pass last element to traverse ltr
}

module.exports = reduce