Sometimes, we may run into the ‘ReferenceError: assignment to undeclared variable "x"’ when we’re developing JavaScript apps.
In this article, we’ll look at how to fix the ‘ReferenceError: assignment to undeclared variable "x"’ when we’re developing JavaScript apps.
Fix the ‘ReferenceError: assignment to undeclared variable "x"’ When Developing JavaScript Apps
To fix the ‘ReferenceError: assignment to undeclared variable "x"’ when we’re developing JavaScript apps, we should make sure that we’re assigning values to variables that have already been declared.
The error message for this error is ReferenceError: "x" is not defined in Chrome.
And in Edge, the error message for this error is ReferenceError: Variable undefined in strict mode.
For instance, we shouldn’t write code like:
const foo = () => {
"use strict";
bar = true;
};
foo();
since bar hasn’t been declared in the foo function.
Instead, we should declare the bar variable by writing:
const foo = () => {
"use strict";
const bar = true;
};
foo();
Now the error should be fixed.
Conclusion
To fix the ‘ReferenceError: assignment to undeclared variable "x"’ when we’re developing JavaScript apps, we should make sure that we’re assigning values to variables that have already been declared.
The error message for this error is ReferenceError: "x" is not defined in Chrome.
And in Edge, the error message for this error is ReferenceError: Variable undefined in strict mode.
