![]() That’s how we know that they are for Arrays-as-lists. If the element type is more complicated, then you need to put them in parentheses: ( number| string)īoth array type literals and Array require all elements to have the same type. typeof is the operator that let’s you determine the type of the expression: javascript. Additionally, there are functions, objects, and the special values undefined and null. ![]() In the following code, the Array type literal is string: const myStringArray: string = Īn Array type literal is a shorthand for using the global generic interface type Array: const myStringArray: Array = In JavaScript, you can find primitive types like strings, numbers, booleans, symbols. interface type Array #Īn Array type literal consists of the element type followed by. Ways of typing Arrays # Array role “list”: array type literals vs. TypeScript accommodates these two roles by offering various ways of typing arrays. The elements do not necessarily have the same type. Tuple: The length of the Array is fixed.Lists: All elements have the same type.const assertions for Arrays and type inferenceĪrrays are used in the following two roles in JavaScript (and sometimes a mix of the two):.Type inference for empty Array literals.Type inference for non-empty Array literals. ![]()
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