55 lines
1.1 KiB
Markdown
55 lines
1.1 KiB
Markdown
### deepMapKeys
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Deep maps an object keys.
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Creates an object with the same values as the provided object and keys generated by running the provided function for each key.
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Use `Object.keys(obj)` to iterate over the object's keys.
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Use `Array.prototype.reduce()` to create a new object with the same values and mapped keys using `fn`.
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```js
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const deepMapKeys = (obj, f) => (
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Array.isArray(obj)
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? obj.map(val => deepMapKeys(val, f))
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: (typeof obj === 'object')
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? Object.keys(obj).reduce((acc, current) => {
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const val = obj[current];
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acc[f(current)] = (val !== null && typeof val === 'object')
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? deepMapKeys(val, f)
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: acc[f(current)] = val;
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return acc;
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}, {})
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: obj
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);
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```
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```js
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const obj = {
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foo:'1',
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nested:{
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child:{
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withArray:[
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{
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grandChild:[ 'hello' ]
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}
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]
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}
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}
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};
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const upperKeysObj = deepMapKeys(obj, (key) => key.toUpperCase());
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/*
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{
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"FOO":"1",
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"NESTED":{
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"CHILD":{
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"WITHARRAY":[
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{
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"GRANDCHILD":[ 'hello' ]
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}
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]
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}
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}
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}
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*/
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```
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