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Types in function arguments and return value. String

suggest change

Example: 

function hello(name: string): string {
    return `Hello ${name}!`;
}

Here the syntax name: string means that the function can accept one name argument and this argument can only be string and (...): string { means that the return value can only be a string

Usage: 

hello('StackOverflow Documentation') // will be return Hello StackOverflow Documentation!
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TypeScript core types:
* TypeScript Core Types
* String Literal Types
* Tuple
* Boolean
* Intersection Types
* Void
* Any
* Enum
* Array
* Types in function arguments and return value. Number
* Types in function arguments and return value. String
* String
* Number
* const Enum
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