People Who Code | Blog: June 2023

Difference between “ == “ and “ === “ operators

<!DOCTYPE html>

<html>

<head>

<meta charset="utf-8">

<meta name="viewport" content="width=device-width, initial-scale=1">

<title>Diff b/w == vs ===</title>

</head>

<body>

<input type="text" id="InputValue" name="InputValue">

<button onclick="checkFunc()">Click Here</button>

<script>

function checkFunc() {

const newArray = [1,2,3,4,5,6,7,8,7,2,1,3,5,6,4,3,6,45,65,34,1,1,2,2];

let InputValue = document.getElementById('InputValue').value;

const filterValue = newArray.filter(v=>v==InputValue)

const findValue = newArray.find(v=>v==InputValue)

if(findValue===InputValue){

// Returns false since the typeof findValue is "number" and typeof InputValue is "string"

console.log('false',InputValue)

} else if(findValue==InputValue){

// Returns true since the value of both findValue and InputValue is the same

console.log('true',InputValue)

}

</script>

</body>

</html>

Simple Way Reverse Javascript Array

<!DOCTYPE html>

<html>

<head>

<title>Simple Way Reverse Javascript Array</title>

</head>

<body>

<button onclick="checkFunc()">Click</button>

function checkFunc() {

const newArray = [1,2,3,4,5,6,7,8];

const copyArray = []

for(let i=7;newArray.length-1; i--){

let tp = newArray[i];

if(tp>0 && newArray.length>=0)

{

copyArray.push(tp)

console.log(copyArray)

}

</script>

</body>

</html>

Simple Way Reverse Javascript Array

What is different between find and Filter?

1. Filter return multiple array

2. find return single return item

<!DOCTYPE html>

<html>

<head>

<meta charset="utf-8">

<meta name="viewport" content="width=device-width, initial-scale=1">

<title>Diff b/w Filter and Find With example</title>

</head>

<body>

<input type="text" id="InputValue" name="InputValue">

<button onclick="checkFunc()">Click Here</button>

<script>

function checkFunc() {

const newArray = [1,2,3,4,5,6,7,8,7,2,1,3,5,6,4,3,6,45,65,34,1,1,2,2];

let InputValue = document.getElementById('InputValue').value;

const filterValue = newArray.filter(v=>v==InputValue)

const findValue = newArray.find(v=>v==InputValue)

console.log(filterValue,findValue)

}

</script>

</body>

</html>

Left Triangle Pattern in JavaScript | Stackblitz

Below Demo With Code

**
***
****
*****

let n = 5;
let string = "";
for (let i = 1; i <= n; i++) {
  for (let j = 0; j < i; j++) {
    string += "*";
  }
  string += "\n";
}
console.log(string);

Right Triangle Pattern in JavaScript | Stackblitz

Below Code With Demo

     *
   **
  ***
 ****
****

let n = 5;
let string = "";
for (let i = 1; i <= n; i++) {
  // printing spaces
  for (let j = 0; j < n - i; j++) {
    string += " ";
  }
  // printing star
  for (let k = 0; k < i; k++) {
    string += "*";
  }
  string += "\n";
}
console.log(string);

Hollow Square Pattern in JavaScript | Stackblitz

Pattern

*****
*   *
*   *
*   *
*****

DEMO CODE

let n = 5; // row or column count
// defining an empty string
let string = "";

for(let i = 0; i < n; i++) { // external loop
  for(let j = 0; j < n; j++) { // internal loop
    if(i === 0 || i === n - 1) {
      string += "*";
    }
    else {
      if(j === 0 || j === n - 1) {
        string += " * ";
      }
      else {
        string +=  ' '; 
      }
    }
  }
  // newline after each row
  string += "\n";
}
// printing the string
console.log(string);





 Click For Demo

Square Star Pattern in Javascript Demo | Stackblitz

CODE:

// Import stylesheets
let n = 5; // row or column count
// defining an empty string
let string = "";

for(let i = 0; i < n; i++) { // external loop
  for(let j = 0; j < n; j++) { // internal loop
    string += "*";
  }
  // newline after each row
  string += "\n";
}
// printing the string
console.log(string);

DEMO

Click For Demo

Square Star Pattern in Javascript Demo

Scaler Topics | JavaScript for Beginners - Getting Started - 1

Q1 -- What is JavaScript?

Ans--- JavaScript is a scripting language used to make the website interactive

Q2 -- What is Node.js?

Ans--- It is a JavaScript runtime and open source , cross-platform environment for server development built on chrome’s V8 Engine

Q3 -- Which HTML tag links a JS file with an HTML file?

Ans--- script

Q4 -- What will be the output of the following code?

let a=3000;
console.log("I love you", a,"!");

Ans---I love you 3000 !

Q5 --  Which of the following scoping type does JavaScript use?

Ans--- Lexical

What is Node.js?

It is a JavaScript runtime and open source , cross-platform environment for server development built on chrome’s V8 Engine

What is JavaScript?

JavaScript is a scripting language used to make the website interactive

People Who Code | Blog

Difference between “ == “ and “ === “ operators

Simple Way Reverse Javascript Array

What is different between find and Filter?

Left Triangle Pattern in JavaScript | Stackblitz

Right Triangle Pattern in JavaScript | Stackblitz

Hollow Square Pattern in JavaScript | Stackblitz

Square Star Pattern in Javascript Demo | Stackblitz

Scaler Topics | JavaScript for Beginners - Getting Started - 1

What is Node.js?

What is JavaScript?

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