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is-function

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is-function

is that thing a function? Use this module to find out

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What is is-function?

The is-function npm package is a simple utility used for checking if a given value is a function. It is particularly useful in JavaScript environments where determining the type of an object can sometimes be less straightforward due to the dynamic nature of the language. This package provides a reliable way to ensure that a variable holds a function before attempting to invoke it, thus preventing runtime errors in code.

What are is-function's main functionalities?

Function Type Checking

This feature allows developers to check if a variable is a function. It supports various types of functions including regular functions, async functions, and arrow functions. It returns true if the variable is a function and false otherwise. This is particularly useful for validating callbacks or any variable that is expected to be a function before invoking it.

const isFunction = require('is-function');

console.log(isFunction(function() {})); // true
console.log(isFunction(async () => {})); // true
console.log(isFunction(() => {})); // true
console.log(isFunction(class MyClass {})); // false
console.log(isFunction({})); // false

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Package last updated on 22 Apr 2020

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