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Lodash _.forOwn

Overview

The lodash _.forOwn method is a powerful utility function that is part of the lodash library, which is a popular JavaScript utility library. It is used to iterate over an object's own properties, executing a callback function for each property.

Syntax:

.forOwn(object, [iteratee=.identity])

Parameters:

  • object (Object): The object whose own enumerable properties are to be iterated over.
  • [iteratee=_.identity] (Function): The function to be executed for every iteration.

Return: This method returns the given object.

The callback function is invoked with three arguments – value, key, and object. Here, the value is the value of the property, the key is the key of the property, and the object is the object being iterated.

Example usage:

const obj = { a: 1, b: 2, c: 3 };

_.forOwn(obj, (value, key) => {
  console.log(key + ": " + value);
});

// Output:  
// a: 1
// b: 2
// c: 3

In the above example, we have an object that has three properties – a, b, and c. We use the _.forOwn method to iterate over the properties of the object and log the value of each property along with its key.

The _.forOwn method is a powerful tool when working with JavaScript objects since it allows for easy property iteration without the need for lengthy and repetitive syntax. Additionally, it can be easily combined with other lodash methods to create powerful functional programming patterns.