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#javascript #typescript

In this code we want every object pushed in to the addressBook array to conform to the Contact interface. When this is compiled to JavaScript this disappears, but this is helpful in development.

interface Contact { name: string, email: string, phone: string
} var addressBook: Contact[] = [];

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TypeScript is clever enough to know the type of the myName variable. Interfaces Interfaces are great ways to set up agreements on the shape of object literals. Sometimes you just need to know the structure of a thing as a data store. <span>In this code we want every object pushed in to the addressBook array to conform to the Contact interface. When this is compiled to JavaScript this disappears, but this is helpful in development. interface Contact { name: string, email: string, phone: string } var addressBook: Contact[] = []; It can warn me in the method call of push if I don’t define the type on line 9. Or if I specify the type on the variable declaration, it could warn me on line 9 that I’m missing


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