What is array.slice() in TypeScript?

Overview

TypeScript is a superset of JavaScript. Wherever JavaScript runs, TypeScript runs, too. We can use the slice() method in TypeScript. This method is used to extract a certain section or parts of the elements of an array.

Syntax

array.slice(begin, end)
Syntax for slice() method in TypeScript

Parameters

begin: This is the index position to start or begin the extraction. It is an integer value.

end: This is the index position to end the extraction. It has be an integer as well.

Return value

The value returned is the part of the array array that was extracted.

Example

// create arrays in TypeScript
let names: string[] = ["Theodore", "James", "Peter", "Amaka"]
let numbers : Array<number>; 
numbers = [12, 34, 5, 0.9]
let cars : Array<string> = ["Porsche", "Toyota", "Lexus"]
let randomValues : Array<string | number> = ["one",1, "two", 2, 56]
// extract some parts of the arrays
let extract1 = numbers.slice(2, 4)
let extract2 = names.slice(1, 3)
let extract3 = cars.slice(0, 2)
let extract4 = randomValues.slice(4,5)
// print out extracted values
console.log(extract1)
console.log(extract2)
console.log(extract3)
console.log(extract4)

Explanation

In the above code, we see the following:

  • Lines 2–6: We create some arrays in TypeScript.
  • Lines 9–12: We extract some parts of the arrays that we created using the slice() method.
  • Lines 15–18: We print the sliced or extracted parts to the console.

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