Day 17: More Exceptions

PHOTO

Mon May 09 2022 22:07:36 GMT+0000 (Coordinated Universal Time)

process.stdin.resume();
process.stdin.setEncoding('ascii');

var input_stdin = "";
var input_stdin_array = "";
var input_currentline = 0;

process.stdin.on('data', function (data) {
    input_stdin += data;
});

process.stdin.on('end', function () {
    input_stdin_array = input_stdin.split("\n");
    main();    
});
function readLine() {
    return input_stdin_array[input_currentline++];
}

//Write your code here
class Calculator {
    constructor (n, p) {
        this.n = n;
        this.p = p;
    }
    
    power(n, p) {
        if (n<0 || p <0) return ("n and p should be non-negative")
        else return Math.pow(n,p)
    }
}
function main(){
    var myCalculator=new Calculator();
    var T=parseInt(readLine());
    while(T-->0){
        var num = (readLine().split(" "));
        try{
            var n=parseInt(num[0]);
            var p=parseInt(num[1]);
            var ans=myCalculator.power(n,p);
            console.log(ans);
        }
        catch(e){
            console.log(e);
        }

    }
}

COPY

Objective Yesterday's challenge taught you to manage exceptional situations by using try and catch blocks. In today's challenge, you will practice throwing and propagating an exception. Check out the Tutorial tab for learning materials and an instructional video. Task Write a Calculator class with a single method: int power(int,int). The power method takes two integers, and , as parameters and returns the integer result of . If either or is negative, then the method must throw an exception with the message: n and p should be non-negative. Note: Do not use an access modifier (e.g.: public) in the declaration for your Calculator class. Input Format Input from stdin is handled for you by the locked stub code in your editor. The first line contains an integer, , the number of test cases. Each of the subsequent lines describes a test case in space-separated integers that denote and , respectively. Constraints No Test Case will result in overflow for correctly written code. Output Format Output to stdout is handled for you by the locked stub code in your editor. There are lines of output, where each line contains the result of as calculated by your Calculator class' power method. Sample Input 4 3 5 2 4 -1 -2 -1 3 Save Sample Output 243 16 n and p should be non-negative n and p should be non-negative Save Explanation : and are positive, so power returns the result of , which is . : and are positive, so power returns the result of =, which is . : Both inputs ( and ) are negative, so power throws an exception and is printed. : One of the inputs () is negative, so power throws an exception and is printed.

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Javacript (Node.js V16.4)

@GreenMark

Sample code to perform I/O algorithm - How to compute minimum number of operation required to make all the elements of sequence equal to each other - Stack Overflow Zoos Divisibility Divisible Best Index Cost of balloons Day 8: Dictionaries and Maps Day 11: 2D Arrays Day 12: Inheritance Day 13: Abstract Classes Life, the Universe, and Everything Roy and Profile Picture Toggle String Palindromic String Count Divisor Day 16: Exceptions - String to Integer Day 20: Sorting Day 10: Binary Numbers Day 17: More Exceptions Day 15: Linked List

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<form action="/new" method="post">
 
  <input name="title" type="text">
  <input name="description" type="text">
  <button type="submit">Submit Form</button>
 
</form>

> More steps

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Get URL and URL Parts in JavaScript

var newURL = window.location.protocol + "//" + window.location.host + "/" + window.location.pathname + window.location.search

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Add event listener to multiple buttons with the same class

    btns = document.getElementsByClassName("saveBtn");
    for (var i = 0; i < btns.length; i++) {
        btns[i].addEventListener("click", function () {
			//Add function here
        });
    }

#javascript

Replace Textarea with Codemirror editor

<link rel="stylesheet" type="text/css" href="plugin/codemirror/lib/codemirror.css">

<body>
	<textarea class="codemirror-textarea"></textarea>
</body>

<script>

$(document).ready(function(){
    var codeText = $(".codemirror-textarea")[0];
    var editor = CodeMirror.fromTextArea(codeText, {
        lineNumbers : true
    });
});

</script>

<script type="text/javascript" src="plugin/codemirror/lib/codemirror.js"></script>

#javascript #nodejs #commandline

HTTPS Redirect in Nodejs

npm install heroku-ssl-redirect

> More steps

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Save to MongoDB without Duplicates Using Mongoose

var mongoose = require('mongoose');
var Schema = mongoose.Schema;

const exampleSchema = new Schema({
    title: { type: String , required: true},
    content: [{type: String}]
});


var Example = mongoose.model('Example', exampleSchema);
module.exports = Example;

> More steps

#html #javascript #jsfunctions #dom #dommanipulation

getAttribute() - how to get the value of any attribute of HTML element

<html>

<input id="contact" name="address">

<script>

    var x = document.getElementById("contact").getAttribute('name');

</script>

</html>

#javascript

Full Stack Developer

function full_stack_developer() {
    full_stack_developer();
}

#javascript

3 Ways To Detect Selenium Bots Using Javascript - CodingTutz

if (navigator.webdriver) {
    document.body.innerHTML = "This is a Bot";
}

#javascript #promises #howto

How to Get the Domain From A URL Using Javascript

var url = "http://scratch99.com/web-development/javascript/";
var urlParts = url.replace('http://','').replace('https://','').split(/[/?#]/);
var domain = urlParts[0];

#javascript #javascript #functions #parameters

Required Parameters for Functions in JavaScript

 const isRequired = () => { throw new Error('param is required'); };

const hello = (name = isRequired()) => { console.log(`hello ${name}`) };

// These will throw errors
hello();
hello(undefined);

// These will not
hello(null);
hello('David');
The idea here is that it uses default parameters, like how the b parameter here has a default if you don’t send it anything:
function multiply(a, b = 1) {
  return a * b;
}

#javascript

Mapping an Object

const object1 = {
  a: 'somestring',
  b: 42
};

for (let [key, value] of Object.entries(object1)) {
  console.log(`${key}: ${value}`);
}

#javascript

Copy Text to Clipboard with Line Breaks

function copyToClipboard(){

    var codeToBeCopied = document.getElementById('code-snippet').innerText;
    var emptyArea = document.createElement('TEXTAREA');
    emptyArea.innerHTML = codeToBeCopied;
    const parentElement = document.getElementById('post-title');
    parentElement.appendChild(emptyArea);

    emptyArea.select();
    document.execCommand('copy');

    parentElement.removeChild(emptyArea);
    M.toast({html: 'Code copied to clipboard'})

    }

#javascript

How to store fetch response in javascript variable - Stack Overflow

async function fun() {
  return fetch('https://jsonplaceholder.typicode.com/todos/1').then(res => res.json());
}

const data  = await fun();

#javascript #jquery

jQuery.post() - AJAX for post requests

$.ajax({
  type: "POST",
  url: url,
  data: data,
  success: success,
  dataType: dataType
});

Day 17: More Exceptions

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Day 17: More Exceptions

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