In TypeScript, arrays are treated as objects and are initialized with default values based on their declared type. The default values for arrays in TypeScript depend on the element type of the array. If you declare an array without initializing its elements explicitly, each element will be assigned a default value according to the type. Here are the default values for common types in TypeScript: Numeric types (number): 0 Boolean type (boolean): false String type (string): "" Object type: null Enum type: The default value is the first value defined in the enum.