Symbol.toPrimitive A method that converts an object to a corresponding primitive value. Called by the ToPrimitive

Tuple Tuple types allow you to express an array where the type of a fixed number of elements is known, but need not be the same. For example

let declarations By now you’ve figured out that var has some problems, which is precisely why let statements

UMD A UMD module is one that can either be used as module (through an import), or as a global (when run in an environment

Grab our runtime dependencies We’ll need to grab Knockout itself, as well as something called RequireJS.

Null and Undefined In TypeScript, both undefined and null actually have their own types named undefined

Write a simple example Let’s write a Hello World program. In src, create the file main.ts:

Extending Interfaces Like classes, interfaces can extend each other. This allows you to copy the members of one interface into another, which

Overloads JavaScript is inherently a very dynamic language. It’s not uncommon for a single JavaScript function to return different types of

Using NuGet with MSBuild Note: You’ll need to configure your project to use the NuGet packages. Please see