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unflattenObject javascript Code Snippet in 2024

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Last Updated: 18 September 2024

Unflatten an object with the paths for keys.

  • Use nested Array.prototype.reduce() to convert the flat path to a leaf node.
  • Use String.prototype.split('.') to split each key with a dot delimiter and Array.prototype.reduce() to add objects against the keys.
  • If the current accumulator already contains a value against a particular key, return its value as the next accumulator.
  • Otherwise, add the appropriate key-value pair to the accumulator object and return the value as the accumulator.
const unflattenObject = obj => Object.keys(obj).reduce((res, k) => { k.split('.').reduce( (acc, e, i, keys) => acc[e] || (acc[e] = isNaN(Number(keys[i + 1])) ? keys.length - 1 === i ? obj[k] : {} : []), res ); return res; }, {});
unflattenObject({ 'a.b.c': 1, d: 1 }); // { a: { b: { c: 1 } }, d: 1 } unflattenObject({ 'a.b': 1, 'a.c': 2, d: 3 }); // { a: { b: 1, c: 2 }, d: 3 } unflattenObject({ 'a.b.0': 8, d: 3 }); // { a: { b: [ 8 ] }, d: 3 }

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