Typing the function
Let’s add types to our simple examples from earlier:
1 2 3 4 5 | function add(x: number, y: number): number { return x + y;}let myAdd = function(x: number, y: number): number { return x+y; }; |
We can add types to each of the parameters and then to the function itself to add a return type. TypeScript can figure the return type out by looking at the return statements, so we can also optionally leave this off in many cases.
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