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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 
const nthElement = (arr, n = 0) => (n > 0 ? arr.slice(n, n + 1) : arr.slice(n))[0];
console.log(nthElement(['a', 'b', 'c'], 1));
console.log(nthElement(['a', 'b', 'b'], -3));

Sample Output:

b
a

Pictorial Presentation:

JavaScript Fundamental: Get the nth element of a given array.

Flowchart:

flowchart: Get the nth element of a given array

Live Demo:

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


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Next: Write a JavaScript program to get every element that exists in any of the two arrays once.

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JavaScript: Tips of the Day

Chunks an array into n smaller arrays

Example:

const tips_chunkIntoN = (arr, n) => {
  const size = Math.ceil(arr.length / n);
  return Array.from({ length: n }, (v, i) =>
    arr.slice(i * size, i * size + size)
  );
}
console.log(tips_chunkIntoN([1, 2, 3, 4, 5, 6, 7,8], 4)); 

Output:

[[1,2],[3,4],[5,6],[7,8]]