TypeError: (intermediate value) is not iterable
A “TypeError” occurs when a value or variable is not of the expected type. The error message “(intermediate value) is not iterable” specifically indicates that a non-iterable value is being used as if it were iterable.
In JavaScript, an iterable is an object which can be looped over using the “for…of” loop, or its elements can be accessed using the spread operator or “Array.from()”. Examples of iterables in JavaScript are arrays, strings, and certain built-in objects like NodeList.
Example 1:
const message = "Hello";
for (const char of message) {
console.log(char);
}
In this example, the “message” variable is a string, which is an iterable. The “for…of” loop iterates over each character of the string and logs it to the console.
Example 2:
const person = {
name: "John",
age: 30
};
for (const prop of person) {
console.log(prop);
}
In this example, the “person” object is not iterable because objects are not directly iterable. Therefore, if you try to iterate over an object using a “for…of” loop or any other iterable-related operation, a “TypeError” will be thrown.
To fix the “TypeError: (intermediate value) is not iterable” error, ensure that you are using an iterable value or object when it is expected. If you need to transform a non-iterable value into an iterable, you can use appropriate methods like “Array.from()” or the spread operator.