TypeScript for Beginners - Union Type

The video tutorial explains the concept of union types in programming, demonstrating how to create a union type that can hold both strings and numbers. It covers the syntax for defining union types using the pipe symbol and shows how to assign values to these types. The tutorial also discusses the compilation process, error handling, and the consequences of removing a type from a union, which leads to compilation errors. The video encourages experimenting with different data types to understand union types better.

What is the purpose of using a union type in programming?

• To make the code more complex

• To improve the speed of the program

• To restrict a variable to a single data type

• To allow a variable to hold multiple data types

Which symbol is used to define a union type?

• Pipe (|)

• Dollar ($)

• Ampersand (&)

• Asterisk (*)

What happens when you assign a number to a variable defined as a union type of string and number?

• The number is ignored

• It causes a compilation error

• The number is converted to a string

• The assignment is successful

What error occurs if you try to assign a number to a variable defined only as a string?

• Type mismatch error

• Syntax error

• Type string is not assignable to type number

• Type number is not assignable to type string

What is the benefit of using union types with different data types?

• It makes the code run faster

• It allows for more flexible code

• It limits the variable to a single data type

• It increases the complexity of the code