Typeerror: right side of assignment cannot be destructured

The error message “TypeError: right side of assignment cannot be destructured” occurs when you try to destructure an invalid or non-destructurable value on the right side of an assignment.

To understand this error, let’s first explain what destructuring assignment is. Destructuring assignment is a feature in JavaScript that allows you to extract values from arrays or objects and assign them to variables in a concise and readable way.

Here’s an example of correct usage of destructuring assignment:

const array = [1, 2, 3];
const [a, b, c] = array; // Destructuring assignment
console.log(a); // Output: 1
console.log(b); // Output: 2
console.log(c); // Output: 3

In the above example, the array is destructured and its values are assigned to variables a, b, and c respectively. This is a valid usage and will work as expected.

Now, let’s see an example that can cause the “TypeError: right side of assignment cannot be destructured” error:

const value = 42;
const [x, y, z] = value; // Error: TypeError: right side of assignment cannot be destructured

In the above example, we are trying to destructure the value variable, which is not an array or an object. This is an invalid usage of destructuring assignment, and it will result in the mentioned error.

To fix this error, ensure that the right side of the assignment is a valid destructurable value, such as an array or an object. If you want to destructure a value that is not an array or an object, you can wrap it in an array or object literal to make it valid.

const value = 42;
const [x, y, z] = [value]; // Destructuring assignment with a wrapped value
console.log(x, y, z); // Output: 42 undefined undefined

In the above fixed example, we wrapped the value variable in an array literal, allowing us to destructure it without causing an error. However, note that since the wrapped value is not an array with three elements, variables y and z are assigned with the value “undefined”.