Array Type Annotations

Snippet

You can specify the type of elements allowed in an array using the square bracket syntax (type[]) after the type name.

snippet.ts
typescript
const colors: string[] = ["red", "green"];
colors.push("blue");

Breakdown

const colors: string[]

Declares an array that must exclusively contain string values.

["red", "green"]

Initializes the array with two initial string elements.

colors.push("blue");

The push method is type-checked; adding another string is permitted.

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