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| /** | |
| * | |
| * @param {array} target | |
| * @param {function} cb: (oldAcc, item, index) -> newAcc | |
| * @param {*} seed | |
| */ | |
| function reduce(target, cb, seed){ | |
| var runningAggregate = seed; | |
| target.forEach(function(item, index){ | |
| runningAggregate = cb(runningAggregate, item, index); | |
| }); | |
| return runningAggregate; | |
| } | |
| // console.log(reduce([3, 4, 5], function(acc, val){ | |
| // return acc + val; | |
| // }, 0), 3); | |
| function sum(arr){ | |
| var runningTotal = 0; | |
| arr.forEach(function(item){ | |
| runningTotal += item; | |
| }); | |
| return runningTotal; | |
| } | |
| function sumFromReduce(arr){ | |
| return arr.reduce(function(runningTotal, item){ | |
| console.log('Iteration', runningTotal, item); | |
| return runningTotal + item; | |
| }, 0); | |
| } | |
| function maxFromReduce(arr){ | |
| return reduce(arr, function(runningMax, item){ | |
| console.log('Iteration', runningMax, item); | |
| if(runningMax > item) return runningMax; | |
| else return item; | |
| }, -Infinity); | |
| } | |
| console.log('Total Sum:', sumFromReduce([3, 4, 5])); | |
| console.log('Total Max:', maxFromReduce([4, 3, 5])); |
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