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TypeScript - Readonly Array

TypeScript comes with a ReadonlyArray<T> type that is the same as Array<T> with all mutating methods removed, so you can make sure you don’t change your arrays after creation. 


let colors : string[] = ["red","white","blue"];
let validColors : ReadonlyArray = colors;

// ok
colors.push("purple");

// not ok
// validColors.push("purple");