#strict mode

Basically, 'use strict'; makes code more consistent and less error prone. You can read about the exact details here.

So should it be used everywhere? Contrary to most sources on the internet, the answer is no. For new projects and completely new code it should be used by default, but applying it to old code can in some rare cases cause that code to work differently. For example, here is some code made in an old JS style without 'use strict':

function addMessage(message) { var self = this || {}; self.messages = self.messages || []; self.messages.push(message); } addMessage('message1'); console.log(window.messages); // ["A message"]

The above occurs because the this value refers to the global scope in non-strict code. With adding 'use strict';:

'use strict'; function addMessage(message) { var self = this || {}; self.messages = self.messages || []; self.messages.push(message); } addMessage('message2'); console.log(window.messages); // undefined

Now this does not automatically set to the global scope in that function. Also, notice how no errors occured. In this case, unit testing that old code first before adding 'use strict'; would have caught this error. Though in some cases even unit testing may not be enough, so it is also necessary to manually analyze if old code will act differently under strict mode. Here is a good source on how to do that.

The good news, is in the future most code will automatically be in strict mode either via tools or by using new language features. For example, the upcoming language feature ES6 Modules will be supported natively in browsers and those modules are automatically in strict mode. Note these modules are different from the Node.js modules (there was no universal module format when Node.js was created). So Node.js code is not automatically in strict mode unless a compiler flag is used.

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Abstract Classes Object reflection Strict Mode JavaScript

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How to implement Abstract Classes & Object reflection & Strict Mode In JavaScript?

In this article we will understand How do I create an Abstract Classes & Object reflection & Strict Mode in JavaScript By Sagar Jaybhay.

Abstract Classes

Object-oriented programming languages like C# and java support abstract classes. These classes are incomplete and when you trying to create an object of that abstract classes it will throw a compile-time error.

The abstract classes are mainly for base classes.

var Shape=function(nameofshape) this.shapeName=nameofshape; throw new Error("You can't create object of this abstract class.") ; Shape.prototype.draw=function() return "Drawing the Shape "+this.shapeName; var Circle=function(name) this.shapeName=name; Circle.prototype=Object.create(Shape.prototype); var circle=new Circle("Circle"); document.writeln("<br/>"); document.writeln("is circle instance of Circle "+(circle instanceof Circle)); document.writeln("<br/>"); document.writeln("is circle instance of Shape "+(circle instanceof Shape)) document.writeln("<br/>"); document.writeln(circle.draw());

Object.create(Shape);

This method is used to create an object of class without using a constructor.

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Abstract Class in JavaScript

Object reflection In JavaScript

C#, java like object-oriented programming languages support a reflection.

Reflection allows us to inspect meta-data of assemblies, modules, and types. Since javascript is an object-oriented programming language it also supports reflection.

var Student=function(firstname,lastname,id) this.FirstName=firstname; this.LastName=lastname; this.Id=id; Student.prototype.getFullname=function() return this.FirstName+" "+this.LastName; Student.prototype.getID=function() return this.Id; var stud=new Student("Sagar","Jaybhay",101); document.writeln("Below are the properties"); for(property in stud) document.writeln("<br/>"); document.writeln(property); document.writeln("<HR>"); document.writeln("Below are the properties with values"); for(property in stud) document.writeln("<br/>"); document.writeln(property+ " : "+stud[property])

Object reflection In JavaScript

Strict Mode In Javascript

ECMAScript version 5 introduced strict mode to javascript. With this use of strict mode it easy to detect javascript silent error as they would throw an error. By using strick mode your debugging is easier and mistakes are reduced. Most modern browsers support strict mode.

In C# or Java, these are object-oriented languages like that Javascript also object-oriented language. But javascript is not very god at reporting errors or throwing an error.

Suppose in c# without declaring the type of variable you cant assign value to it. C# compiler will throw the compile-time error.

Fullname=”sagar”

But in javascript without declaring variable you can assign value to that variable. But this behavior you want to suppress.

"use strict"; mystring="sagar"; document.writeln(mystring);

Then you need to use strict mode.

Strict Mode In JavaScript

To overcome this I declare variable an error goes off.

"use strict"; var mystring="sagar"; document.writeln(mystring);

Strict Mode In JavaScript 1

You can write a strict mode in function also means you want to monitor a function and rather than typing the use strict in the whole script file you can type inside the function like below.

var display=function() "use strict"; var mystring="sagar"; document.writeln(mystring); display();

The rules are applied inside the function and if you write any variable outside the function that will work regular one.

Summary

By using above code example you will able to understand How do I create an abstract base class & Object reflection & Strict Mode in JavaScript By Sagar Jaybhay.

GitHub Project Link :- https://github.com/Sagar-Jaybhay/JavaScript-All-Labs

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MySQL: Solve sql_mode=only_full_group_by Error by Turning off Strict SQL Mode

When moving an older MySQL-based project to a new server instance, one of the SQL query errors bound to immediately strike is that of triggering the sql_mode=only_full_group error, caused by your SQL select statements referring to columns that are not functionally dependent on the GROUP BY column. (Best explained here in the MySQL documentation)

This new, “Strict SQL Mode” (which is actually a…

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Write a file on the disk

Read a file from the disk

Use the network

In the main thread, following the strict mode, the 3 things above are not allowed. Actually, the objects that conduct the 3 things are not allowed to be used by the main thread.

This policy is called the strict mode.

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