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Arrays are a fundamental part of the JavaScript language because they provide a powerful way to store and manage data collections. Any level of experience will require an understanding of arrays in order to write effective and efficient code. in this article we are providing some basic Javascript Array Coding Questions And Answers.
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Why To Learn JavaScript ?
People who are interested in web development and coding, learning javascript is quite useful. However there are many reasons to learn javascript. A few of them are given below:
- A plethora of resources, libraries, and frameworks are at the disposal of JavaScript developers due to the size and activity of the community.
- To create dynamic and interactive web pages, JavaScript is required. When creating the client-side of web applications, it collaborates with HTML and CSS.JavaScript is now a full-stack development language since Node.js made it possible to utilize it for server-side programming.
- The vast ecosystem of JavaScript libraries (jQuery, D3.js) and frameworks (React, Angular, Vue.js) makes development easier and more efficient.
- Since its syntax is very straightforward and you may see results right away when working for the web, JavaScript is regarded as one of the more approachable programming languages for novices.
- JavaScript is a critical component of many web apps developed by major tech companies like Microsoft, Facebook, and Google. Because of the ECMAScript standard, JavaScript is continuously gaining new capabilities and enhancements.
- There are lots of JavaScript hackathons, conferences, and meetups that offer chances to network and learn. Because JavaScript is the foundation of many open-source projects, developers can participate and work together on these projects.
Javascript Array Coding Questions And Answers
1: Which of the following is a JavaScript framework/library?
Q: What does the following code return?
const passwords = [‘secret’,’secret123′,’dct’]
const result = passwords. filter(function(ele){
return ele.length>=5{)
console.log(result)
Ans: [‘secret’,’secret123′]
Q: What do we pass as an argument to the find method?
Ans: function
Q: What does the find method return if an element in the array satisfies the condition?
Ans: element
Q: Given an array
const players =[‘sachin’,virat’,dhoni’]
in the code
players. forEach (function (p)
{
console .log(p)
} )
How many times does the function called?
Ans: 3
Q: Can we use the break kwyword in the forEach method ?
Ans: No
Q: In what order do we access elements in the array ?
Ans: Ascending order
Q: What is the purpose of using array find method ?
Ans: It helps to find the first element based on the conditon in the array
Q: What is the return value of the push method ?
Ans: new length of the array
Q: Which method is used to add an item to the begining of the array?
Ans: unshift()
Q: What is the output of the following code?
const numbers = [10,20,30,40,50]
numbers.pop(3)
console.log(numbers)
Ans: [10,20,30,40]
Q: How to add two arrays in javascript ?
Ans: concat()
Q: If the element we are looking for is not present in the array, what does the indexOf() return?
const numbers = [10,20,30,40]
console.log(numbers.indexOf(50))
Ans: -1
Q: How many arguments we can pass to the forEach method?
Ans: 1
Q: Why do we use the array forEach method?
Ans: to iterate and access every single element in the array
Q: What is the syntax for array reduce in javascript?
Ans: array.reduce(callbackfunction(total, curValue, curIndex, array), initialValue)
Q: What is the syntax for array map method in javascript?
Ans: array.map(function(currentValue, index, arr), thisValue)
Q: How to flatten a nested array in javascrpit?
Ans: By using the .flat() method
Q: Write a javascript array code that uses array reduce method to find the sum of given array elements?
Ans:
let arr = [1, 2, 3, 4, 5, 6]
function sumofArray( sum, num)
{
sum+num;
}
function my(item);
{
console.log(arr.reduce(sumofArray));
}
my();
Q: How to remove an element from an array from a specific index?
Ans: By using splice() method
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Frequently Asked Questions
How do you find the index of an element in an array?
BY using the indexOf method.
How do you convert an array to a string?
BY using the join method or toString method.
How do you find the length of an array?
By using the length property.
ow do you iterate over an array?
By using loops such as for, for...of, forEach, or map.
