JavaScript: Get the n^th element of a given array

JavaScript fundamental (ES6 Syntax): Exercise-173 with Solution

Get nth Array Element

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

• 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:

// Define a function 'nthElement' that takes an array 'arr' and an optional parameter 'n' (defaulted to 0)
const nthElement = (arr, n = 0) => 
  // If 'n' is positive, return a new array containing the element at index 'n'
  // If 'n' is negative, return a new array containing the element at index 'n' from the end of the array
  // If 'n' is zero or not provided, return the first element of the array
  (n > 0 ? arr.slice(n, n + 1) : arr.slice(n))[0];
// Log the element at index 1 of the array ['a', 'b', 'c']
console.log(nthElement(['a', 'b', 'c'], 1)); // 'b'
// Log the element at index -3 of the array ['a', 'b', 'b']
console.log(nthElement(['a', 'b', 'b'], -3)); // 'a'

Output:

b
a

Visual Presentation:

Flowchart:

Live Demo:

See the Pen javascript-basic-exercise-173-1 by w3resource (@w3resource) on CodePen.

For more Practice: Solve these Related Problems:

• Write a JavaScript program that returns the element at the nth index of an array, handling negative indices as counting from the end.
• Write a JavaScript function that uses array destructuring to extract the nth element from an array.
• Write a JavaScript program that validates the index and returns the nth element, or a default value if out-of-bounds.
• Write a JavaScript function that accepts an array and a number n, then returns the element at index n using slice.

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