4 years ago

Type inference is the ability to derive types from other pieces of code. This is how I decide when or when not to explicitly add types in TypeScript. In this first example, the least amount of types possible were added: the parameters. TypeScript infers that result is a number despite not adding a return type to divide, or a type declaration to the result variable.

TypeScript knows that result has the same type of whatever divide returns, which is a number.