In Typescript, we have three ways to work with it using: typeof: the keyword helps to check value types, like boolean, string, number, etc. instanceof: the keyword to compare the object instance with a class constructor. type guards: The powerful way to check types using typescript featu...
Type aliases Check the Class Type on Runtime in TypeScript TypeScript supports theclasskeyword from the EcmaScript 6. It can be used to write your code in an OOP way. Let’s create the classEngineer. classEngineer{} Let’s add a method since this class doesn’t contain any properties ...
Also, we can use == to perform undefined checks in TypeScript. When == is used in the strict-check method, it will only check the type of the value, unlike the === operator.The == operator can do a null check using the strict-check method. It will return true if a variable is...
To check if a string is empty in TypeScript, you can use thelengthproperty by verifying ifstr.length === 0, or use strict equality by comparing the string directly to an empty string withstr === "". Additionally, to handle strings that contain only whitespace, you can usestr.trim()....
To check the version of TypeScript, utilize the “tsc -v” or the “tsc –version” commands on the command prompt or the VS terminal. However, the stated commands will show the “tsc: command not found” error if TypeScript is not installed on your system. This post described the proc...
Type casting is a feature in TypeScript that allows developers to explicitly change the type of a value from one type to another. Type casting is particularly useful when you’re working with dynamic data, or when the type of a value is not correctly inferred automatically. ...
The“switch”statement is used to check different cases in TypeScript. Here it is utilized for converting the string into a boolean depending on the cases. Code const String:string ='false'; letvalue: boolean; switch(String){ case'true': ...
contract that classes must follow, such as the members that those classes must implement, and you can also represent types in your application, just like the normaltypedeclaration. (For more abouttypes, check outHow to Use Basic Types in TypeScriptandHow to Create Custom Types in TypeScript....
Another way to check for null or undefined is to use the nullish coalescing operator (??), which was introduced in TypeScript 3.7. This operator returns the left-hand side of the expression if it’s not null or undefined, and the right-hand side otherwise: const var1 = null ?? 'Pick...
Use the `npm ls typescript` command to check which version of `typescript` is installed locally in your project.