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To check if a variable is an array in JavaScript, you can use the Array.isArray() method. let myVariable = [1, 2, 3]; let isItArray = Array.isArray(myVariable); console.log(isItArray); // Output: true

The typeof operator in JavaScript is used to determine the data type of a variable or an expression. let x = 10; let y = "Hello"; console.log(typeof x); // Output: "number" console.log(typeof y); // Output: "string"

In JavaScript, keys in an array are the numeric indices used to access its elements. Arrays start counting from 0, so the first element is at index 0, the second at index 1, and so on. let myArray = [10, 20, 30]; console.log(myArray[0]); // Output: 10

split() method in JavaScript - Ans - split() method is used to split a string into an array of substring.

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How to particularly check if a variable is array in JavaScript?

What is typeOf operator in JavaScript?

What are keys in array in JavaScript?

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Correct answer is: ["Orange", "Lemon"] Why? - Answer- The slice() method in JavaScript extracts a section of array. Here fruits.slice(1, 3) will start extracting the elements from index 1 upto index 3. However index 3 element will not be included in the returned array by splice method. Questions arises- what is array? What is index in array?

What will be the Output? const fruits = ["Banana", "Orange", "Lemon", "Apple", "Mango"]; const citrus = fruits.slice(1, 3);

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