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bifurcateBy javascript Code Snippet in 2022

arrayintermediate

Last Updated: 26 November 2022

Splits values into two groups, based on the result of the given filtering function.

  • Use Array.prototype.reduce() and Array.prototype.push() to add elements to groups, based on the value returned by fn for each element.
  • If fn returns a truthy value for any element, add it to the first group, otherwise add it to the second group.
const bifurcateBy = (arr, fn) => arr.reduce((acc, val, i) => (acc[fn(val, i) ? 0 : 1].push(val), acc), [ [], [], ]);
bifurcateBy(['beep', 'boop', 'foo', 'bar'], x => x[0] === 'b'); // [ ['beep', 'boop', 'bar'], ['foo'] ]

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