Uses Less Memory. Works Faster.

1. Welcome
2. Introducing Go
3. Let’s Go!
4. Variables, Constants, and Assignments
5. Basic Data Types
6. Control Structures
7. Arrays, Slices, and Maps
8. User-Defined Types
9. Concurrency
10. Standard Packages
11. Go Further 

  defaultChecks() {
    const author = { firstName: "Vahid", lastName: "N" };
    console.log(author.lastname);
    author.lastName.trimStart();
    author.firstName.charCodeAt("1");
  }

  > npm install -g tslint typescript

{
    "compilerOptions": {
        "strictNullChecks": true
    }
}

  getSessionItem(key: string): any {
    const data = window.sessionStorage.getItem(key);
    return JSON.parse(data);
  }

[ts]
Argument of type 'string | null' is not assignable to parameter of type 'string'.
Type 'null' is not assignable to type 'string'.
const data: string | null

  getSessionItem(key: string): any {
    const data = window.sessionStorage.getItem(key);
    if (data) {
      return JSON.parse(data);
    } else {
      return null;
    }
  }

  noImplicitReturns(a: number) {
    if (a > 10) {
      return a;
    }
    // No return in this branch
  }

{
    "compilerOptions": {
        "noImplicitReturns": true
    }
}

 [ts] Not all code paths return a value.

{
    "compilerOptions": {
        "allowUnreachableCode": false
    }
}

    allowUnreachableCode() {
      if (false) {
        console.log("Unreachable code");
      }
      const a = 1;
      if (a > 0) {
        return 10; // reachable code
      }
      return 0;
      console.log("Unreachable code");
    }

  unusedLocals() {
    const a = "foo"; // Error: 'a' is declared but its value is never read
    return "bar";
  }

  unusedParameters(n: number) {
    n = 0; // Never read
  }

{
    "compilerOptions": {
        "noUnusedLocals": true,
        "noUnusedParameters": true
    }
}

[ts] 'a' is declared but its value is never read.
[ts] 'n' is declared but its value is never read.

  excessPropertyForObjectLiterals() {
    let x: { foo: number };
    x = { foo: 1, baz: 2 };  // Error, excess property 'baz'
    let y: { foo: number, bar?: number };
    y = { foo: 1, baz: 2 };  // Error, excess property 'baz'
  }

{
    "compilerOptions": {
        "suppressExcessPropertyErrors": false
    }
}

[ts]
Type '{ foo: number; baz: number; }' is not assignable to type '{ foo: number; }'.
Object literal may only specify known properties, and 'baz' does not exist in type '{ foo: number; }'.
(property) baz: number

  fallthroughCasesInSwitchStatement(a: number) {
    switch (a) {
      case 0:
        break;

      case 1:
        a += 1;

      case 2:
        a += 2;
        break;
    }
  }

{
    "compilerOptions": {
        "noFallthroughCasesInSwitch": true
    }
}

  indexingObjectsLackingIndexSignatures() {
    const x = { a: 0 };
    x["a"] = 1; // ok
    x["b"] = 1; // Error, type '{ a: number; }' has no index signature.
  }

{
    "compilerOptions": {
        "suppressImplicitAnyIndexErrors": false
    }
}

[ts] Element implicitly has an 'any' type because type '{ a: number; }' has no index signature.

{
    "compilerOptions": {
        "noImplicitAny": true
    }
}

  noImplicitAny(args) { // Error: Parameter 'args' implicitly has an 'any' type.
    console.log(args);
  }

  noImplicitAnyArgs(args: string[]) { // ok with the type information
    console.log(args);
  }

REDMOND, Wash. —June 4, 2018—Microsoft Corp. on Monday announced it has reached an agreement to acquire GitHub, the world’s leading softwareh development platform where more than 28 million developers learn, share and collaborate to create the future. Together, the two companies will empower developers to achieve more at every stage of the development lifecycle, accelerate enterprise use of GitHub, and bring Microsoft’s developer tools and services to new audiences. 

ASPNET Core has a lot of changes compared with the others versions of ASP.NET. One change I want to highlight is the new way to configure settings. With previous versions, this configuration was made by using the common file web.config, but this file simply doesn’t exist anymore in ASP.NET Core. Instead, a new easy way to declare and access to the settings is provided. Let’s take a look. 

When you start working on a new web application you will probably need to analyze different tools to deal with the different functionalities that you have to work on. As soon as you start searching for alternatives you are going to run across Angular and React, they are without any doubt two of the major options to consider, at least till today.

PostgreSQL Tutorial Full Course 2022

I provide here in this PostgreSQL tutorial a full course you can use to master PostgreSQL. Postgres is an object relational database that is just as fast as MySQL that adheres more closely to SQL standards and excels at concurrency. Postgres is also superior at avoiding data corruption.

TABLE OF CONTENTS
00:00 Intro
00:30 Why Use Postgres?
01:13 What is a Database
03:12 Change Database Theme
03:53 Create a Database
04:46 Design a Database
05:50 Turn Invoice into a Database
07:04 Make a Table
12:13 Data Types
16:36 Adding Data to Table
18:15 To See Data
18:25 SELECT
19:19 Create Custom Type
20:48 Change Column Data Type
22:58 Thinking About Tables
25:37 Breaking Up Tables
27:03  Primary & Foreign Keys
32:40 Foreign & Primary Keys
33:28 Altering Tables Many Examples
53:00 Getting Data from One Table
53:40 Where
54:30 Conditional Operators
55:48 Logical Operators
58:12 Order By
59:32 Limit
1:01:45 GROUP BY
1:03:11 Distinct
1:05:00 Getting Data from Multiple Tables
1:05:21 Inner Join
1:08:50 Join 3 Tables
1:13:15  Arithmetic Operators
1:13:45 Join with Where
1:14:55 Outer Joins
1:17:03 Cross Joins
1:18:16 Unions
1:19:27 Extract
1:21:05 IS NULL
1:22:03 SIMILAR LIKE & ~
1:29:25 GROUP BY
1:31:14  HAVING
1:32:18  AGGREGATE FUNCTIONS
1:34:22 WORKING WITH VIEWS
1:45:01 SQL Functions
1:49:00 Dollar Quotes
1:50:06 Functions that Return Void
1:52:38 Get Maximum Product Price
1:53:39 Get Total Value of Inventory
1:54:26 Get Number of Customers
1:56:15 Named Parameters
2:01:30 Return a Row / Composite
2:03:38 Get Multiple Rows
2:07:08 PL/pgSQL
2:11:35 Variables in Functions
2:15:55 Store Rows in Variables
2:19:17 IN INOUT and OUT
2:21:01 Using Multiple Outs
2:25:56 Return Query Results
2:33:42 IF ELSEIF and ELSE
2:38:48  CASE Statement
2:42:01 Loop Statement
2:45:20 FOR LOOP
2:48:34 Result Sets, Blocks & Raise Notice
2:51:11 For Each and Arrays
2:53:20 While Loop
2:54:54 Continue
3:01:34 Stored Procedures
3:09:35 Triggers
3:29:25 Cursors
3:39:45 Installation 

 Microsoft today officially announced the release date of the next feature update for Windows 10, formerly referred to as the "Spring Creators Update" but known officially as the "Windows 10 April 2018 Update." 

The fourth preview of .NET 7 includes enhancements to observability in the .NET implementation of OpenTelemetry, the addition of properties to track microseconds and nanoseconds in date and time structures, new metrics for caching extensions, performance-boosting “on stack replacement,” APIs to work with .tar archives, and additional features as part of an ongoing effort to improve the performance of and add features to regular expressions in .NET 7.