Ruby Basics

Basics of Ruby

 

Start Ruby interpret

On terminal just type rib

ruby_docs $ irb
3.0.0 :001 > name = "This is the first string in Ruby"
 => "This is the first string in Ruby"
3.0.0 :002 > name.length
 => 32
3.0.0 :003 >

Introduction to Objects

Everything is an object

self

Talking to objects

3.even?

Method chains, it will give you 3 as output.

1.next.next

if you want to know the all applicable methods on any object just use the methods on the instance like below.

self.methods
self.methods.sort
"This is string".methods.sort

More Objects and Methods

Looking up methods

1.minutes
1.methods.sort

Invoking methods with arguments

['rock','paper','scissors'].index('paper')

use the between? method to determine if the number 2 lies between the numbers 1 and 3.
 

2.between?(1,3)

Syntactic Sugar for Special Methods

Special Methods

4.+(3)
1+2   # this is same as 1.+(2) 

words = ["foo", "bar", "baz"]
words[1]

above code can be written in below style.

words = ["foo", "bar", "baz"]
words.[](1)

page end here

compare two branches

 git diff <local branch> <remote>/<remote branch>

For example, git diff main origin/main, or git diff featureA origin/next




git diff origin/master  upstream/master

git diff master upstream/master

Git command Cherry-Pick

To get the commit changes in your branch, use the cherry-pick command of git as below.

    $ git cherry-pick commit-hash
  

changing the commit message of the last commit.

    $ git commit --amend -m "New commit message"

then do

    $ git push

version

 war {

    dependsOn('generateBuildVersion')

    archiveName 'lms.war'

    from('../frontend/dist')

}

task generateBuildVersion {

    doLast {

        def jsonFile = file('../frontend/src/app/version.json')

        def parsedJson = new groovy.json.JsonSlurper().parseText(jsonFile.text)

        parsedJson.versionNumber = parsedJson.versionNumber + 0.01

        parsedJson.releaseDate = Date.newInstance().format('MM/dd/yyyy')

        def jsonStr = JsonOutput.toJson(parsedJson)

        def jsonData = JsonOutput.prettyPrint(jsonStr)

        jsonFile.write(jsonData)

    }

}

{

    "versionNumber": 1.03,

    "releaseDate": "09/01/2022"

}

src/app/version.json

LoginComponent.ts

  versionNumber: number;

  releaseDate: string;

  

  

  constructor(

    private notification: NotificationService

  ) {

    this.versionNumber = this.sessionService.versionNumber;

    this.releaseDate = this.sessionService.releaseDate;

  }

  

  

  

SessionService.ts

  versionNumber: number;

  releaseDate: string;

  

    constructor() {

      this.versionNumber = +version.versionNumber;

    this.releaseDate = version.releaseDate;

  }

  LoginComponent.html

  

                <div>

                <p class="alignleft">{{ releaseDate }}</p>

                <p class="alignright">{{ versionNumber }}</p>

              </div>

  

  

package json

{

  "name": "lms-web",

  "version": "1.0.0",

  "scripts": {

    "ng": "ng",

    "start": "ng serve --proxy-config proxy.conf.json --live-reload false --port 4200",

    "build": "ng build --prod --aot --build-optimizer --common-chunk --vendor-chunk --optimization --progress --base-href /projname/",

    "test": "ng test --code-coverage --watch false",

    "lint": "ng lint",

    "lintcs": "ng lint --format checkstyle > checkstyle/frontend.xml",

    "e2e": "ng e2e --base-href /projname/ --aot --webdriver-update false --proxy-config proxy.conf.json"

  },

  "private": true,

  "dependencies": {

    "@angular/animations": "~11.2.4",

  },

  "devDependencies": {

    "@angular-devkit/build-angular": "~0.1102.3",

  }

}

 

intelli j short cut keys

 

Ctrl + Shift + F	Search a word in All files in a project
Ctrl + Shift + N	Search for a file by name
Ctrl + N	Open any class quickly
Ctrl + E	Open recent files
Ctrl + Alt + à	Navigate further to the files
Ctrl + Alt + ß	Navigate to the previous files
Ctrl + F3	Navigate to occurrence in forward direction
Shift + F3	Navigate to occurrence in the backward direction
Ctrl + H	Type hierarchy / Class Hierarchy
Ctrl + Alt + L	Format Code inside a file
Alt + Enter	To import the classed from jars
Ctrl + Alt + O	Optimize imports (never import package/class, Only optimize)
Ctrl + F12	Open methods in pop up with All methods and variables

 

 

 

 

 

F8	Run/execute      // This will jump to another breakpoint
F10	Step Over            // This can be used to step by step line debugging
F11	Step Into              // This will go inside method call
F12	Close DevTools/end debugging
Ctrl + p	Open source code file in DevTools

 

primeng appendto

 <div class="container-fluid" #parentDiv>

  <div class="row">

    <mat-toolbar color="primary">

      <span (click)="openHomePage($event)">Student management System</span>

      <span class="example-spacer"></span>

      <p-dropdown [options]="listItems" [(ngModel)]="selectedItem" [appendTo]="parentDiv" placeholder="Select Year Period"

                  (onChange)="valueOnChange($event)" dataKey="value">

        <ng-template let-item pTemplate="selectedItem">

          <div class="option-wrapper">

            <span class="option-value">{{selectedItem}}</span>&nbsp;

          </div>

        </ng-template>

        <ng-template let-object pTemplate="item">

          <div class="option-wrapper">

            <span class="option-value">{{object.value}}</span>&nbsp;

            <mat-icon class="option-icon">{{object.label}}</mat-icon>

          </div>

        </ng-template>

      </p-dropdown>

      </mat-toolbar>

  </div>

</div>