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Learning TypeScript 2.x - Second Edition
book

Learning TypeScript 2.x - Second Edition

by Remo H. Jansen
April 2018
Beginner content levelBeginner
536 pages
13h 21m
English
Packt Publishing
Content preview from Learning TypeScript 2.x - Second Edition

Functions with REST parameters

We have learned how to use optional and default parameters to increase the number of ways that we can invoke a function. Let's return one more time to the previous example:

function add(foo: number, bar: number, foobar: number = 0): number { 
    return foo + bar + foobar; 
} 

We have learned how to invoke the add function with two or three parameters, but what if we wanted to allow other developers to pass four or five parameters to our function? We would have to add two extra default or optional parameters. And what if we wanted to allow them to pass as many parameters as they need? The solution to this possible scenario is the use of REST parameters. The REST parameter syntax allows us to represent an indefinite ...

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Publisher Resources

ISBN: 9781788391474Supplemental Content