A Typescript enum allows us to define the collection of related values to be used by name. They make the code easier to read. You may use them when you want to limit the values that a variable can take to a small set of possible values. Javascript does not support enums, hence typescript creates runtime artifact to support them ( Except, const enum which do not have a runtime artifact). TypeScript provides both numeric and string-based enums.
Type Assertion allows us to override the compiler determined type in our code. It is something similar to type casting in other languages. except that it does not restructure or modify the type in any way. The Type Assertion in TypeScript is a compile-time feature
Typescript types are Nullable Types. i.e you can assign Null & undefined to any of the types. The compiler will not throw any error. But from the Typescript version 2.0, we can define Non Nullable types with the –strictNullChecks flag on. The strictNullChecks is flag is set to false by default. But, when set to true in tsconfig.json it stops us from assigning the null & undefined to a type. Thus converting the types into Non Nullable types.
Nullable Types / Non Nullable Types in TypeScript Read More »
Intersection types allow us to combine two or more types into one. The resulting type will have all the properties of all the types. This allows us to get a Single type from existing types that has all the properties of both the types
A Type Guard is a technique where Typescript gets type information of a variable after making a type check using a conditional such as an if statement (or switch statement), an else if or an else.
Narrowing Types in Typescript Using Type Guards Read More »
