or in js
// The Or operator in Javascript is 2 vertical lines = ||
//Example
var firstnumber = 10;
var secondnumber = 20;
//The Or operator in action
if(firstnumber > 20 || secondnumber< 10) {
}or in js
// The Or operator in Javascript is 2 vertical lines = ||
//Example
var firstnumber = 10;
var secondnumber = 20;
//The Or operator in action
if(firstnumber > 20 || secondnumber< 10) {
}javascript and operator
//AND Operator expressed as &&
const x = 7;
const y = 4;
(x == 7 && y == 5); // false
(x == 3 && y == 4); // false
(x == 7 && y == 4); // true
if (condition == value && condition == otherValue) {
return something;
}js comparison operators
Javascript Comparison Operators
== Equal to
=== Equal value and equal type
!= Not equal
!== Not equal value or not equal type
> Greater than
< Less than
>= Greater than or equal to
<= Less than or equal to
? Ternary operatoror operator in javascript
//The OR operator in Javascript is 2 verticals lines: ||
var a = true;
var b = false;
if(a || b) {
//one of them is true, code inside this block will be executed
}js or operator
// index.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>js or operator</title>
</head>
<body>
<h1 class="display_msg">Add</h1>
<input type="text" name="num1" id="num1" /><br />
<input type="text" name="num2" id="num2" /><br /><br />
<button type="button" onclick="btnClicked()">Add</button>
<br /><br />
<span class="valid_details"></span>
<script src="app.js"></script>
</body>
</html>
// app.js
function btnClicked() {
// value 1 and 2 from html input fields (with id 'num1' and 'num2')
// you can also use document.querySelector
let num1 = document.getElementById("num1").value;
let num2 = document.getElementById("num2").value;
// simple addition of num1 and 2 stored in 'result'
// use innerHTML to display the results in the browser
let result = (document.querySelector(".display_msg").innerHTML =
Number(num1) + Number(num2));
// some sort of validation using 'or' '||'
if (
num1 === "" ||
num2 === "" ||
num1 === 0 ||
num1 === "0" ||
num2 === 0 ||
num2 === "0"
) {
result = document.querySelector(
".display_msg"
).innerHTML = `Invalid Input!!!`;
return result;
} else {
return result;
}
/*
* this will not print because return statement will basically end the function
* https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/return
*/
console.log(result);
}js or operator
/*OR operator:*/
||
// example:
var a = 10;
var b = 5;
if(a > 7 or b > 7){
print("This will print!")
}
// Even though a is not less than 7, b is, so the program will print
// the statement.Copyright © 2021 Codeinu
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