Promises

PHOTO

Thu Apr 08 2021 08:03:40 GMT+0000 (Coordinated Universal Time)

// Promise takes two functions as arguments
// You call resolve when the function succeeds
const okPromise = new Promise(function(resolve, reject) {
    resolve({result: ['1','2']}) // you can pass data to the callback
  });
  
   // You call reject when it fails
   const koPromise = new Promise(function(resolve, reject) {
    reject(new Error('not found')) // you can pass data to the callback
  });
  
  // The promise rejects if you throw an error
  const throwedPromise = new Promise(function(resolve, reject) {
    throw new Error('not found') // you can pass data to the callback
  });
  
  // Promise can be created using "async" keyword
  // It resolves with returned value
  // Rejects if an error is thrown
  const asyncPromise = async function() {
    return true;
  }
  
  // You can call other promises by using .then for getting the result
  okPromise.then(function(result) {
    console.info(result) // {result: ['1','2']}
  }).catch((err) => console.info(err)) // nothing displayed
  // Use .catch for catch the error of a promise
  koPromise.then(function(result) {
    console.info(result) // nothing displayed
  }).catch((err) => console.info(err)) // Error: not found

COPY

https://harsh-patel.medium.com/collection-of-javascript-snippets-728b2565793b

Save snippets that work from anywhere online with our extensions

Comments

JS

@Pepe

Switch statement vs Object Search map() & .reduce() Methods for merging (aka concatenating) arrays Promises Promise.all vs Promise.allSettled Array: .map() vs .filter() vs .reduce() Multiple Condition Checks

#html #javascript #nodejs

How to Save HTML Form Data in JSON - Express

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

> More steps

#javascript

Get URL and URL Parts in JavaScript

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

#javascript

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

#javascript #nodejs

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 #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

3 Ways To Detect Selenium Bots Using Javascript - CodingTutz

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

#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 #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

Mapping an Object

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

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

#javascript #jquery

jQuery.post() - AJAX for post requests

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

#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();

Promises

Save snippets that work from anywhere online with our extensions

Comments

More like this

JS

Browse more snippets >>

Promises

Save snippets that work from anywhere online with our extensions

Comments

More like this

JS

Browse more snippets >>

Embed code snippet