Home/ srikanth tekumudi/Answers
  1. Asked: April 23, 2022In:

    How to Print to Console in Javascript

    srikanth tekumudi
    srikanth tekumudi Junior < Frontend Developer at Phenom /> || Mock Interviewer || Javascript || to teach React || Content Creator

    There are various ways to to console info. Here are some important methods of console API console.log() console.log(123); //number console.log("Hello World!"); //string console.log(10 + 20); //expression console.log(new Date()); //object console.clear() console.log(10); console.log("Hello World!");Read more

    There are various ways to to console info.

    Here are some important methods of console API

    console.log()

    console.log(123); //number 
console.log("Hello World!"); //string 
console.log(10 + 20); //expression 
console.log(new Date()); //object

    console.clear()

    console.log(10); 

console.log("Hello World!"); 

console.clear(); console.log("All above logs cleared");

    console.error()

    let num1 = 10, num2 = 0;
if (num2 !== 0) {
console.log(num1 / num2);
}
else {
console.error("divided by 0");
}

    console.assert()

    console.assert(false, "Statement is false"); 

var num = 10; console.assert(num > 20, "Number is less than 20"); 

console.assert(25 === '25', "25 is not equal to '25'", { "SomeObject": 12345 });

    console.table() :

    const arr = ["a", "b", "c", "d", "e"];
console.table(arr);
const user = {
name: "Henry",
id: "iuA98",
age: 22
}
console.table(user);
o/p: user info in table format

    console.time() and console.timeEnd()

    console.time("trackLoop"); 

for (let i = 0; i < 10000; i++) { } 

console.timeEnd("trackLoop");

0/p: trackerLoop - 1ms

     

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  2. Asked: April 23, 2022In:

    What Does NaN Mean in Javascript

    srikanth tekumudi
    srikanth tekumudi Junior < Frontend Developer at Phenom /> || Mock Interviewer || Javascript || to teach React || Content Creator
    This answer was edited.

    NaN is Not-A-Number. There are five different types of operations that return NaN:Number cannot be parsed (e.g. parseInt("blabla") or Number(undefined))Math operation where the result is not a real number (e.g. Math.sqrt(-1))Operand of an argument is NaN (e.g. 7 ** NaN)Indeterminate form (e.g. 0 * IRead more

    NaN is Not-A-Number.

    There are five different types of operations that return NaN:
    Number cannot be parsed (e.g. parseInt(“blabla”) or Number(undefined))
    Math operation where the result is not a real number (e.g. Math.sqrt(-1))
    Operand of an argument is NaN (e.g. 7 ** NaN)
    Indeterminate form (e.g. 0 * Infinity, or undefined + undefined)
    Any operation that involves a string and is not an addition operation (e.g. “foo” / 3)

    ex:

    isNaN(NaN); // true

    isNaN(Number.NaN); // true NaN === NaN; // false Number.NaN === NaN; // false

    What is the type of NaN?

    The type of NaN, which stands for Not a Number is, surprisingly, a number. The reason for this is, in computing, NaN is actually technically a numeric data type. However, it is a numeric data type whose value cannot be represented using actual numbers

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  3. Asked: April 23, 2022In:

    How to Convert Set to Array in Javascript

    srikanth tekumudi
    srikanth tekumudi Junior < Frontend Developer at Phenom /> || Mock Interviewer || Javascript || to teach React || Content Creator

    There are 3 ways to convert set to array: Method 1: using spread operator let myset =new Set([1,2,3,4,5]) let myarr=[...myset] console.log(myarr) Method 2: using Array.From() let myset =new Set([1,2,3,4,5]) const myarr = Array.from(myset); console.log(myarr) Method 3: using for loop let myset =new SRead more

    There are 3 ways to convert set to array:

    Method 1:

    using spread operator

    let myset =new Set([1,2,3,4,5])

let myarr=[...myset]

console.log(myarr)

    Method 2:

    using Array.From()

    let myset =new Set([1,2,3,4,5])

const myarr = Array.from(myset);

console.log(myarr)

    Method 3:

    using for loop

    let myset =new Set([1,2,3,4,5])

const myarr = []

myset.forEach(x=>myarr.push(x))

console.log(myarr)
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  4. Asked: June 18, 2022In:

    What is innerhtml in javascript

    srikanth tekumudi
    srikanth tekumudi Junior < Frontend Developer at Phenom /> || Mock Interviewer || Javascript || to teach React || Content Creator
    This answer was edited.

    InnerHTML is a property of every element. It tells you what is between the starting and ending tags of the element, and it also let you sets the content of the element. innerHTML will show the value and apply any HTML formatting. Ex: HTML: <div id='content'> Hi this is awesome </div> js:Read more

    InnerHTML is a property of every element. It tells you what is between the starting and ending tags of the element, and it also let you sets the content of the element.

    innerHTML will show the value and apply any HTML formatting.

    Ex:

    HTML: 

    <div id='content'> Hi this is awesome </div>

    js: 

    let ele= document.getElementById('content') ele.innerHTML='<h1>text changed </h1>'

    ouput:

     text changed

    (in h1 style) innerHTML apply any HTML formatting in string.

    InnerText:

    InnerText wont apply HTML formatting

    ex:

    let ele= document.getElementById('content') 
    ele.innerText='<h1>text changed </h1>' 

output:

<h1>text changed </h1> (html formatting will not apply here. It is interpreted as String only)
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  5. Asked: June 13, 2022In:

    How to empty an array in JavaScript

    srikanth tekumudi
    srikanth tekumudi Junior < Frontend Developer at Phenom /> || Mock Interviewer || Javascript || to teach React || Content Creator
    This answer was edited.

    There are  4 ways to empty array: method 1 (set length of variable as 0) ex: let arr=[1,2,3,4,5,6] arr.length=0 console.log(arr) output: [] Method 2 (Assign empty array to variable) ex:  let arr=[1,2,3,4,5,6] arr=[]; console.log(arr) output: [] Method 3 (Using splice) let arr=[1,2,3,4,5,6] arr.splicRead more

    There are  4 ways to empty array:

    method 1 (set length of variable as 0)

    ex:

    let arr=[1,2,3,4,5,6] 

arr.length=0 

console.log(arr)
output: []

    Method 2 (Assign empty array to variable)

    ex: 

    let arr=[1,2,3,4,5,6]
arr=[];
console.log(arr)
output:
[]

    Method 3 (Using splice)

    let arr=[1,2,3,4,5,6] 

    arr.splice(0,arr.length) 

    console.log(arr)

    output:

    []

     

    Method 4 (by popping)

    let arr=[1,2,3,4,5,6]
while(arr.length > 0) {
arr.pop();
}

console.log(arr)

 output: []
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  6. Asked: June 18, 2022In:

    How do I convert Javascript object to json

    srikanth tekumudi
    srikanth tekumudi Junior < Frontend Developer at Phenom /> || Mock Interviewer || Javascript || to teach React || Content Creator
    This answer was edited.

    short answer:  use JSON.stringify() There are 3 ways to use this: JSON.stringify(value, replacer)JSON.stringify(value)JSON.stringify(value, replacer)JSON.stringify(value, replacer, space) Below is demonstration JSON.stringify(value)// convert obj to jsonex:let obj={"name": "srikanth", age:26, phoneNRead more

    short answer: 

    use JSON.stringify()

    There are 3 ways to use this:

    JSON.stringify(value, replacer)

    JSON.stringify(value)
    JSON.stringify(value, replacer)

    JSON.stringify(value, replacer, space)

    Below is demonstration

    JSON.stringify(value)
    // convert obj to json
    ex:
    let obj={"name": "srikanth", age:26, phoneNo:9321234576}
    let jsonObj=JSON.stringify(obj)
    console.log(jsonObj)

    output:
    {“name”:”srikanth”,”age”:26,”phoneNo”:9321234576}

     

    JSON.stringify(value, replacer)
    ( to select keys in object)

    let obj={"name": "srikanth", age:26, phoneNo:9321234576}

    let jsonObj=JSON.stringify(obj,["name","age"])
    console.log(jsonObj)

    output:
    {“name”:”srikanth”,”age”:26}

    JSON.stringify(value, replacer, space)
     (to format output of stringified json)

    let obj={"name": "srikanth", age:26, phoneNo:9321234576}
    let jsonObj=JSON.stringify(obj,null,' ')
    console.log(jsonObj)

    output:
    {
    “name”: “srikanth”,
    “age”: 26,
    “phoneNo”: 9321234576
    }

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