When using reduce, I prefer to always return a new pure array rather than pushing to an existing array. Keeping reduce stateless has resulted in less debugging for me.
const exampleValues = [2, 15, 8, 23, 1, 32]; const [truthyValues, falseyValues] = exampleValues.reduce(([truthy, falsey], value) => { if (value > 10) { return [truthy.concat(value), falsey]; } else { return [truthy, falsey.concat(value)]; } }, [[], []]);
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When using reduce, I prefer to always return a new pure array rather than pushing to an existing array. Keeping reduce stateless has resulted in less debugging for me.