An array is a user-defined data type. An array is a homogeneous collection of similar types of elements that have a contiguous memory location and which can store multiple values of different data types.
An array is a type of data structure that stores the elements of similar data type and consider it as an object too. We can store only a fixed set of elements and can’t expand its size, once its size is declared.
The array follows Index based storage i.e)the first element of an array is stored at index 0 or at index ‘i’ and the remaining elements are stored at the location ‘i+1’.
Features of an Array
- Same data type of elements is stored in an array.
- Array elements are always stored in contiguous memory locations.
- Storage of 2-D array elements are rowed by row in a contiguous memory location.
- The Starting element of address is represented by the array name.
- The size of an array should be declared at the time of initialization.
- The remaining elements of an array can be retrieved by using the starting index of an Array.
1. Using square brackets.
let array_name[:datatype] = [val1, val2, valn..]
2. Using a generic array type.
TypeScript array can contain elements of different data types, as shown below.
let array_name: Array = [val1, val2, valn..]
Example: Multi Type Array
Example: Access Array Elements
- Array elements access on the basis of index i.e.)ArrayName[index].
- We can access the array elements by using the ‘FOR’ loop:
Code Optimization: We can retrieve or sort the array data more efficiently.
Random access: We can randomly access the array data using the location pointer.
Size Limit: The size of an Array is fixed i.e.)static. We cannot increase the array size once it has been declared.
There are two types of an array:
It is the simplest form of an array that contains only one row for storing data. It contains single set of the square bracket (“”).
array_name = [val1, val2, valn..]
Array: 1 Array: 2
The data is stored in rows and columns (also known as matrix form) in a Multi-dimensional array.
let arr_name:datatype = [ [a1, a2, a3], [b1, b2, b3] ];
let arr_name:datatype[initial_array_index][referenced_array_index] = [ [val1, val2, val 3], [v1, v2, v3]];
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We can create an Array by using or initializing the Array Object. The Array constructor is used to pass the following arguments to create an Array:
- With the numeric value which represents the size of an array.
- A list of comma separated values.
1.let arr_name:datatype = new Array(values);
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Passing an Array to a Function
We can pass an Array to a function by specifying the Array name without an index.
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Using TypeScript ‘Spread’ operator
The spread operator can be used to initialize arrays and objects from another array or object. It can also be used for object destructuring. It is a part of ECMAScript 6 version.
CopiedArray: 1, 2, 3 NewArray: 1, 2, 3, 7, 8 MergedArray: 1, 2, 3, 4, 5, 6