TypeScript array object:
A TypeScript Array object represents a collection of elements of the same type.
TypeScript Array Object Properties:
| Property | Description |
| constructor | Returns a reference to the array function that created the object. |
| length | It reflects the number of elements in an array. |
| prototype | It allows us to add properties and methods to an object. |
TypeScript Array Object Methods:
| Method | Description |
| concat() | Returns a new array comprised of this array joined with other array(s) and/or value(s). |
| every() | Returns true if every element in this array satisfies the provided testing function. |
| filter() | Creates a new array with all of the elements of this array for which the provided filtering function returns true. |
| forEach() | Calls a function for each element in the array. |
| indexOf() | Returns the first (least) index of an element within the array equal to the specified value, or -1 if none is found. |
| join() | Joins all elements of an array into a string. |
| lastIndexOf() | Returns the last (greatest) index of an element within the array equal to the specified value, or -1 if none is found. |
| map() | Creates a new array with the results of calling a provided function on every element in this array. |
| pop() | Removes the last element from an array and returns that element. |
| push() | Adds one or more elements to the end of an array and returns the new length of the array. |
| reduce() | Apply a function simultaneously against two values of the array (from left-to-right) as to reduce it to a single value. |
| reduceRight() | Apply a function simultaneously against two values of the array (from right-to-left) as to reduce it to a single value. |
| reverse() | Reverses the order of the elements of an array — the first becomes the last, and the last becomes the first. |
| shift() | Removes the first element from an array and returns that element. |
| slice() | Extracts a section of an array and returns a new array. |
| some() | Returns true if at least one element in this array satisfies the provided testing function. |
| toSource() | Represents the source code of an object |
| sort() | Represents the source code of an object |
| splice() | Adds and/or removes elements from an array. |
| toString() | Returns a string representing the array and its elements. |
| unshift() | Adds one or more elements to the front of an array and returns the new length of the array. |
How to create TypeScript array object:
- By using array literals.
- By using Array() constructor.
By using array literals:
Using an array literal is the simplest way to create a TypeScript Array.
Syntax:
var array1:string[] = ["element1","element2","elementN"];
Example:
function arrayTest(names:string):void{
for (i=0;i
By using Array() constructor:
We can create a TypeScript Array object by using Array() constructor.
Syntax:
var array1 = new Array(“element1”, “element2”, “elementN”);
Example:
function arrayTest(names:string):void{
for (i=0;i
