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Lodash _.overArgs

Overview

_.overArgs is a method provided by the Lodash library, which is a popular utility library for JavaScript. It is used to create a new function that applies a transformation function to the arguments passed to it before invoking the original function.

The basic syntax for _.overArgs is as follows:

_.overArgs(func, [transforms])

Here, func is the function that we want to modify, and transforms is an array of transformation functions that will be applied to the corresponding arguments before invoking func. The resulting function will have the same number of arguments as func.

For example, consider the following function:

function multiply(x, y) {
  return x * y;
}

We can create a new function that doubles both the arguments before invoking multiply using _.overArgs:

const doubleArgs = _.overArgs(multiply, [(arg) => arg * 2, (arg) => arg * 2]);

doubleArgs(2, 3); // Returns 12

In this example, we passed an array with two transformation functions, both of which double their respective arguments.

We can also use _.overArgs to modify functions that accept multiple arguments:

function sum(x, y, z) {
  return x + y + z;
}

const doubleArgs = _.overArgs(sum, [(arg) => arg * 2, (arg) => arg * 2, (arg) => arg * 2]);

doubleArgs(1, 2, 3); // Returns 12

In this example, we passed an array of three transformation functions, one for each argument.

_.overArgs can be particularly useful when you need to modify the behavior of an existing function without modifying its source code or creating a new function. It can also help reduce duplication when you have multiple functions that need the same transformation logic applied to their arguments.

Keep in mind that _.overArgs creates a new function, so it may have a slight impact on performance. However, in most cases, the performance impact is negligible.

Overall, _.overArgs is a powerful method that can help make your code more concise and expressive by allowing you to easily modify the behavior of existing functions.