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Looks good for the most part. I would suggest that you try to keep your indentation consistent throughout your code. In some places you indent by 4 spaces, but most of the time you indent by 2 spaces. Pick one and stick with it.
| // Combine all elements into a single value going from left to right. | ||
| // Elements will be passed one by one into `cb`. | ||
| // `memo` is the starting value. If `memo` is undefined then make `elements[0]` the initial value. | ||
| if (memo === undefined) { |
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You can just do if (!memo) here.
| // If `cb` returns `true` then return that element. | ||
| // Return `undefined` if no elements pass the truth test. | ||
| for (let i = 0; i < elements.length; i++) { | ||
| if (cb(elements[i]) === true) return elements[i]; |
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You can just do if (cb(elements[i])) to check for truthiness.
| // Return an empty array if no elements pass the truth test | ||
| const newArr = []; | ||
| for (let i = 0; i < elements.length; i++) { | ||
| if (cb(elements[i]) === true) newArr.push(elements[i]); |
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