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Lodash _.ary


The lodash _.ary() method creates a new function that accepts up to n arguments of the provided function, ignoring any additional arguments beyond n. This allows you to control the number of arguments passed to a function when it is called, providing greater flexibility and control over function behavior.

The syntax for _.ary() is as follows:

_.ary(func, [n=func.length])

Where func is the function to modify, and n is the maximum number of arguments to accept.

Here's an example usage:

function foo(a, b, c) {
  return [a, b, c];

var newFoo = _.ary(foo, 2);

console.log(newFoo(1, 2, 3)); // [1, 2]

In this example, _.ary() is used to modify the foo() function to accept only up to 2 arguments. The new function, newFoo(), can be called with 2 arguments as expected, while any additional arguments beyond 2 are ignored.

_.ary() can be particularly useful when working with functions that expect a fixed number of arguments. By limiting the number of arguments that can be passed to a function, you can ensure that it behaves consistently and predictably in all situations.

One thing to note is that _.ary() does not modify the original function, but rather creates a new function that behaves differently. If you need to modify the original function in place, you'll need to reassign the modified function to the same variable or property.

Overall, _.ary() is a powerful tool in the JavaScript developer's toolkit for controlling function behavior and ensuring consistent behavior across your codebase.