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Interfaces and Type Declarations

Video Lecture

Description

In TypeScript, Interfaces and Type declarations offer almost the same exact functionality, in this video we explore that idea.

An Interface/Type is a structure used for type-checking.

An Interface/Type defines the properties and types an object can have.

interface Quux {
    quuz: string
    corge: number
}

function foo(bar: Quux) {
    return 'Hello, ' + bar.quuz + ' ' + bar.corge
}

let baz: Quux = { quuz: 'ABC', corge: 123 }

console.log(foo(baz))

Try it,

tsc foo.ts
node foo.js