Two ways to deal with this problem is to use om or the Object.keys method.

The above example will throw the 'TypeError: forEach is not a function' error, because the obj object is not an array or an array-like object, and therefore does not have the forEach() method. The forEach() method is a method that is defined on the Array.prototype, so it can only be called on an array or an object that inherits from the Array class.įor example, if you try to call the forEach() method on a regular JavaScript object, like this: const obj = The 'TypeError: forEach is not a function' error is thrown when the code attempts to call the forEach() method on a value that is not an array or an array-like object. It’s focused entirely on providing quick and easy solutions for JavaScript-related problems. This guide is part of the “ Common JavaScript Errors” series. It can be useful to get a type from an array of values so that you can use it as, say, the input to a function to restrict the values that can be passed to it.

In TypeScript, the forEach loop has the same syntax as in JavaScript. If you have a list of items and want to perform operations on each array element, you can use the forEach loop. TypeError: forEach is not a function in JavaScript TypeScript forEach Definition and Usage The forEach loop is a JavaScript function that is used to iterate between array elements.

Typescript for each array