JavaScript: Check whether the provided argument is array-like

JavaScript fundamental (ES6 Syntax): Exercise-205 with Solution

Write a JavaScript program to check if the provided argument is an array (i.e. iterable).

• Check if the provided argument is not null and that its Symbol.iterator property is a function.

Sample Solution:

JavaScript Code:

//#Source https://bit.ly/2neWfJ2 
const isArrayLike = val => {
  try {
    return [...val], true;
  } catch (e) {
    return false;
  }
};
console.log(isArrayLike(document.querySelectorAll('.className'))); // true
console.log(isArrayLike('abc')); // true
console.log(isArrayLike(null)); // false

Sample Output:

true
true
false

Flowchart:

Live Demo:

See the Pen javascript-basic-exercise-205-1 by w3resource (@w3resource) on CodePen.

Improve this sample solution and post your code through Disqus

Previous: Write a JavaScript program that will check whether the given argument is a native boolean element.
Next: Write a JavaScript program to check if a given string is an anagram of another string (case-insensitive, ignores spaces, punctuation and special characters).