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Ungroup array elements
JavaScript, Array · Oct 22, 2020
Creates an array of arrays, ungrouping the elements in an array produced by zip.
- Use
Math.max(),Function.prototype.apply()to get the longest subarray in the array,Array.prototype.map()to make each element an array. - Use
Array.prototype.reduce()andArray.prototype.forEach()to map grouped values to individual arrays.
const unzip = arr =>
arr.reduce(
(acc, val) => (val.forEach((v, i) => acc[i].push(v)), acc),
Array.from({
length: Math.max(...arr.map(x => x.length))
}).map(x => [])
);unzip([['a', 1, true], ['b', 2, false]]); // [['a', 'b'], [1, 2], [true, false]]
unzip([['a', 1, true], ['b', 2]]); // [['a', 'b'], [1, 2], [true]]More like this
Ungroup array elements based on function
JavaScript, Array
Creates an array of elements, ungrouping the elements in an array produced by zip and applying the provided function.
Group array elements
JavaScript, Array
Creates an array of elements, grouped based on their position in the original arrays.
Group array elements based on function
JavaScript, Array
Creates an array of elements, grouped based on the position in the original arrays and using a function to specify how grouped values should be combined.