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TypeScript Union Type tutorial


TypeScript union type:

TypeScript Union Type provides the facility to combine one or two types for a variable. The pipe symbol (|) is used to combine the two or more data types.

Syntax:

var varName: dataType1|dataType2|dataType3

Example:

function unionTest(value:string|number):void{
  console.log(value); 
}
unionTest("Jai");
unionTest(123);

Try it:

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TypeScript Tutorial

TypeScript Overview.
Typescript vs Javascript.
Typescript let vs var.
TypeScript Hello World.
Typescript Data Types.
Typescript Variable Declaration.
TypeScript operators list.
TypeScript Arithmetic Operators.
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Typescript String Operator.
Typescript typeof Operator.
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Typescript anonymous function.
Typescript function constructor.
Typescript Arrow/Lambda function.
Typescript function overloading.
TypeScript number object.
TypeScript string object.
TypeScript boolean object.
TypeScript date object.
TypeScript math object.
TypeScript array object.
TypeScript tuples.
TypeScript union type.
TypeScript interface.
TypeScript interface inheritance.
TypeScript interface multiple inheritance.
TypeScript class.
Typescript class inheritance.
Typescript class interface.
TypeScript abstract class.
TypeScript object.
TypeScript duck typing.
TypeScript NameSpace.
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TypeScript module.
TypeScript ambient module.


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