Package Exports

deep-map-keys

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Readme

Deep Map Keys

Deep Map Keys recurses through an object and transforms its keys – and the keys of any nested objects – according to some function.

Install

Install Deep Map Keys via npm.

npm install --save deep-map-keys

Usage

Suppose we want to change the keys of an object from snake case to camel case. We can do something like this:

const deepMapKeys = require('deep-map-keys');

let comment = {
  comment_id: 42,
  user_id: 1024,
  user_name: 'Mufasa',
  content: 'You deliberately disobeyed me.',
  viewed_by: [
    { user_id: 3820, user_name: 'Rafiki' },
    { user_id: 8391, user_name: 'Zazu' }
  ]
};

let result = deepMapKeys(comment, key => {
  return key.replace(/_(\w)/g, (match, char) => char.toUpperCase());
});

And the result will look like this:

{
  commentId: 42,
  userId: 1024,
  userName: 'Mufasa',
  content: 'You deliberately disobeyed me.',
  viewedBy: [
    { userId: 3820, userName: 'Rafiki' },
    { userId: 8391, userName: 'Zazu' }
  ]
}

API

`deepMapKeys(object, mapFn, [options])`

Parameters

Param	Type	Description
object	`any`	The object whose keys are to be transformed. Typically, this will be a complex object containing other nested objects. This object may be an `Array`, in which case the keys of any objects it contains will be transformed.
mapFn	`function`	The function used to transform each key. The function is called with two arguments: key <`string`> The key being transformed value <`any`> The value of the node whose key is being transformed The return value determines the new name of the key, and must therefore be a string.
[options]	`object`	An optional options object. The following option is accepted: thisArg <`any = undefined`> Sets the value of `this` within `mapFn()`

Returns

Returns a new object.

deep-map-keys