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codenamezjames/reduce-copy.js

Last active August 17, 2017 19:41
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reduce-copy.js
const arr = [1,2,3,4,5,6,7,8]
const arrCopy = arr.reduce(function(lastVal, currentVal){
lastVal.push(currentVal)
return lastVal // whate ever we return gets used as the next "lastVal" paramater
}, [])//this empty array argument gets used as "lastVal" on the loops first iteration
arr.push(9)// altering the first array
console.log(arr)
console.log(arrCopy)
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