In this lesson, we are going to learn about functions, function type in TypeScript, spread operator, rest parameters, function overloading, and other function related lessons.
In the above example, we have declared a function with the name
sum that accepts argument
b. It performs arithmetic sum operation on these two operands and returns a result.
In an ideal situation, these two arguments must be numbers or values of the type
Also, we expect the return value of this function to be a
number but is a prototype method of a
string value. Luckily, the return value was a
string (not ideal though) and our program did not crash.
As you can see, the program above is not ideal to run in mission-critical situations. We need to know if our program can work safely before it is deployed to the mission. This is where TypeScript can help us. Before compiling the program, TypeScript walks through each function call of
sum and checks if arguments are all right. Let’s redesign the program above.
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