In JavaScript, the error “TypeError: someFunction is not a function” typically occurs when you’re trying to call a function that doesn’t exist or is not defined. Here are some steps to help you solve this error:
Check the spelling of the function name: Make sure that the function name is spelled correctly and matches the name of the function that you’re trying to call. Even a small typo can cause this error.
Check the scope of the function: Make sure that the function is in scope and can be accessed where you’re trying to call it. If the function is defined inside a block or a conditional statement, it might not be accessible outside of that scope.
Check the function declaration: Make sure that the function is declared properly. If the function is declared with a variable or a constant, make sure that it is assigned to a function expression or a function declaration.
Check if the function has been loaded: If you’re trying to call a function that is defined in another file, make sure that the file has been loaded before you call the function. You can use tools like the developer console or debugger to check if the file has been loaded.
Check if there are conflicting variable names: Sometimes, variable names can conflict with function names. Make sure that there are no variables with the same name as the function that you’re trying to call.
Check the data type of the variable: Make sure that the variable you’re trying to call the function on is of the correct data type. If the variable is not an object or a function, you won’t be able to call a function on it.
By following these steps, you should be able to solve the “TypeError: someFunction is not a function” error in JavaScript.