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Lodash _.updateWith


The lodash _.updateWith method is a powerful utility function that allows developers to easily modify and update nested objects or properties based on a specified path. This function takes in an object, a path to the property or nested property to update, and a function that specifies how to update the property.

Using _.updateWith, developers can avoid the hassle of writing complex and convoluted nested property update functions. This allows for more concise and readable code, making it easier for other developers to understand and maintain.

The _.updateWith function accepts four parameters:

  1. object (Object): The object to update.
  2. path (Array|string): The path of the property to update.
  3. updater (Function): The function to customize assigned values.
  4. [customizer] (Function): The function to customize assigned values.

The path parameter accepts string or array representations of object property paths. For example, to access the property of an object, you would pass in the path ['foo', 'bar'] or alternatively ''.

The updater parameter is a function that receives the current value of the property, and should return the updated value. The return value of the updater function will be assigned to the property.

The customizer parameter is an optional function that provides further control over the update process. It is called with five arguments: objValue, key, value, object, and source. value is the result of updater. Return the value from the customizer block to use that as the value for the path currently being updated.

Using this method, developers can create powerful nested object update functions that are easy to read and maintain. By enabling developers to easily update nested properties using a single function call, _.updateWith streamlines nested object modification, saving valuable development time and effort.