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Hey Yogesh Chavan

Good tips thanks. By the way, I can add my two cents to your article.

• In getting the last element of the array section, in the first example arr.slice(-1) will return [50] not the value 50.
• For checking if it is an array I guess we can also use below code

   const isArray = Object.prototype.toString.call(arr) == "[object Array]"