JavaScript : Get the nth element of a given array

JavaScript fundamental (ES6 Syntax): Exercise-109 with Solution

Write a JavaScript program to get the nth element of a given array.

• Use Array.prototype.slice() to get an array containing the nth element at the first place.
• If the index is out of bounds, return undefined.
• Omit the second argument, n, to get the first element of the array.

Sample Solution:

JavaScript Code:

//#Source https://bit.ly/2neWfJ2

// Define a function 'nthElement' to return the nth element of an array.
const nthElement = (arr, n = 0) =>
  // Use ternary operator to check if 'n' is greater than 0.
  // If true, use 'slice' to extract the nth element from 'arr' and return it.
  // If false, use 'slice' to extract the nth element from the end of 'arr' and return it.
  (n > 0 ? arr.slice(n, n + 1) : arr.slice(n))[0];

// Test the 'nthElement' function with examples.
console.log(nthElement(['a', 'b', 'c'], 1)); // Output: 'b'
console.log(nthElement(['a', 'b', 'b'], -3)); // Output: 'a'

Output:

b
a

Visual Presentation:

Flowchart:

Live Demo:

See the Pen javascript-basic-exercise-109-1 by w3resource (@w3resource) on CodePen.

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