nkhil

Find the longest palindrome (JavaScript)

This is my solution to the longest palindrome kata on Code Wars.

Solution

  function reverseString(st) {
    return st.split('').reverse().join('')
 }

nkhil

Given an array (arr) as an argument complete the function countSmileys that should return the total number of smiling faces. Rules for a smiling face:

• Each smiley face must contain a valid pair of eyes. Eyes can be marked as : or ;
• A smiley face can have a nose but it does not have to. Valid characters for a nose are - or ~
• Every smiling face must have a smiling mouth that should be marked with either ) or D
• No additional characters are allowed except for those mentioned.
• Valid smiley face examples: :) :D ;-D :~)
• Invalid smiley faces: ;( :> :} :]

nkhil

// ./src/handlers/healthcheck.js

'use strict'

function ping(_, res) {
  res.status(200).json({ message: 'OK' });
}

module.exports = { 
  ping,

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'use strict';

const express = require('express');
const cors = require('cors');
const path = require('path');
const { OpenApiValidator } = require('express-openapi-validator');
const config = require('./config');

const app = express();
const apiSpec = path.join(__dirname, `../definitions/${config.name}.yml`);

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paths:
  /healthcheck/ping:
    get:
      description: Returns the readiness of the service
      operationId: ping
      x-eov-operation-id: ping
      x-eov-operation-handler: healthcheck
      parameters:
        - $ref: '#/components/parameters/x-correlation-id'
      responses:

nkhil

Quick reference for using node-scheduler

Every 5 seconds

const x = schedule.scheduleJob('*/5 * * * * *', function() {
  console.log('The answer to life, the universe, and everything!');
});

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{
    "window.zoomLevel": 0,
    "terminal.integrated.shell.osx": "zsh",
    "editor.fontFamily": "Fira Code",
    "editor.fontLigatures": true,
    "editor.minimap.enabled": false,
    "workbench.iconTheme": "material-icon-theme",
    "workbench.editor.enablePreview": false,
    "editor.tabSize": 2,
    "editor.rulers": [100],

nkhil

MongoDB Cheat Sheet

Show All Databases

show dbs

Show Current Database

nkhil

const property = obj[key];
// obj[key] here will be '1991'.

acc[property] = acc[property] || [];
// At this point acc['1991'] doesn't yet exist, so it will be an empty array. This step is important as it checks if acc['1991'] exists, and if not, creates it and assigns a value of an empty array.

acc[property].push(obj);
// Here, all we're doing is pushing our object into the right group

nkhil

function groupBy(key) {
  return function group(array) {
    return array.reduce((acc, obj) => {
      const property = obj[key];
      acc[property] = acc[property] || [];
      acc[property].push(obj);
      return acc;
    }, {});
  };
}