the syntax { [field]: bio } represents dynamic property keys in an object. It allows you to use the value of a variable (field) as a key for the object.

Explanation

1. Dynamic Key:

   • The [field] inside the square brackets means the key is not static but is dynamically determined by the value of the field variable.

2. Value Assignment:

   • The bio part is the value associated with the dynamically created key.

Example

javascript



const field = "bio";  // Key name is dynamic
const bio = "This is a dynamic bio field."; // Value

const data = { [field]: bio };

console.log(data);
// Output: { bio: "This is a dynamic bio field." }

In this case, the value of the variable field ("bio") becomes the key of the data object, and the value of the bio variable ("This is a dynamic bio field.") becomes the associated value.

Use Case in Your Context

When making a PATCH request to your backend, this is useful for dynamically sending only the updated field instead of the entire object.