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Learn TypeScript: The Complete Course for Beginners

Avoiding `any` at Any Time Possible

Understand the risks of using the any type in TypeScript and its impact on runtime errors and code clarity. Learn how defining explicit types enhances safety when handling variables, especially with integrations like JSON responses. This lesson helps you write clearer, safer code by minimizing reliance on any.

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Dangerous world #

You must avoid (as much as possible) the type any, principally because it can hold any value and therefore doesn’t enforce any protections. If you are integrating an existing JavaScript project with TypeScript, every variable will be, by default, set to any until they are defined.

TypeScript 3.3.4
let x: any = "string";
x = true;
x = { title: "Object with a string member" };
x = [1, 2, 3];
x = 1;

This is also the case ...