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@zakfisher
Created September 21, 2016 19:00
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// Create our array-flattening method (using a recursive approach)
const flatten = (arr) => {
// Return a new flattened array
return arr.reduce((prev, next) => {
// Make sure we have an array to add items to
prev = Array.isArray(prev) ? prev : [prev]
// If the next element in `arr` is not an array, add it to our flattened array
// Otherwise, pass the child array to this method, to be flattened recursively
return prev.concat(Array.isArray(next) ? flatten(next) : next)
})
}
// Try it out!
const x = [1, [2, 3], [[4], 5, 6]]
const y = flatten(x) // [1, 2, 3, 4, 5, 6]
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