JavaScript Arrays

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JavaScript Arrays

You can use arrays in JavaScript to store multiple values in a single variable. JavaScript arrays allow you to organize and manipulate collections of data. They are useful for storing lists, sets of values, or any data element that you can access by its index number.

What are JavaScript Arrays?

JavaScript arrays are a type of object that holds multiple values in a specific order. They can contain any data type, including numbers, strings, objects, or even other arrays. Arrays in JavaScript are zero-indexed, meaning the first element is at index 0.

JavaScript Arrays Example

// JavaScript array example
// Create a JavaScript array called fruits
var fruits = ['apple', 'banana', 'cherry'];
for (var i = 0; i < fruits.length; i++) {
  document.write(fruits[i] + '<br/>');
}
document.write("Array length: " + fruits.length);

FAQ (Interview Questions and Answers)

1. What is the purpose of JavaScript arrays?
   JavaScript arrays are used to store multiple values in a single variable.
   JavaScript arrays are used for mathematical calculations.
   JavaScript arrays are used for defining functions.
   
2. What is the syntax for creating a JavaScript array?
   array[]
   array{}
   [] meaning square brackets
   
3. How do you access elements in a JavaScript array?
   By using parentheses
   By using index numbers
   By using quotation marks
   
4. Can a JavaScript array contain different data types?
   Yes, a JavaScript array can contain any data type.
   No, a JavaScript array can only contain numbers.
   No, a JavaScript array can only contain strings.
   
5. How can you determine the length of a JavaScript array?
   By using the "length" method
   By accessing the "length" property
   By using the "size" property
   

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