8ee50178f3
Correct: `Array.from()` (it’s a static method) Incorrect: `Array.join()` (doesn’t exist; it’s a prototype method) This patch uses the common `#` syntax to denote `.prototype.`.
31 lines
972 B
Markdown
31 lines
972 B
Markdown
### unflattenObject
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Unflatten an object with the paths for keys.
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Use `Object.keys(obj)` combined with `Array.prototype.reduce()` to convert flattened path node to a leaf node.
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If the value of a key contains a dot delimiter (`.`), use `Array.prototype.split('.')`, string transformations and `JSON.parse()` to create an object, then `Object.assign()` to create the leaf node.
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Otherwise, add the appropriate key-value pair to the accumulator object.
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```js
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const unflattenObject = obj =>
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Object.keys(obj).reduce((acc, k) => {
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if (k.indexOf('.') !== -1) {
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const keys = k.split('.');
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Object.assign(
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acc,
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JSON.parse(
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'{' +
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keys.map((v, i) => (i !== keys.length - 1 ? `"${v}":{` : `"${v}":`)).join('') +
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obj[k] +
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'}'.repeat(keys.length)
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)
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);
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} else acc[k] = obj[k];
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return acc;
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}, {});
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```
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```js
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unflattenObject({ 'a.b.c': 1, d: 1 }); // { a: { b: { c: 1 } }, d: 1 }
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```
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