What s the difference between JavaScript and JScript

Question

I have always wondered WHaT tHE HecK    is the difference between JScript and JavaScript

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As far as I can tell  two things    ActiveXObject constructor The idiom f x    y  which is roughly equivalent to f x    y

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Long time ago  all browser providers were making JavaScript engines for their browsers and only they and god knew what was happening inside this  One beautiful day  ECMA international came and said  let s make engines based on common standard  let s make something general to make life more easy and fun  and they made that standard  Since all browser providers make their JavaScript engines based on ECMAScript core  standard    For example  Google Chrome uses V8 engine and this is open source  You can download it and see how C   program translates a command  print  of JavaScript to machine code   Internet Explorer uses JScript  Chakra  engine for their browser and others do so and they all uses common core

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Javascript  the language  came first  from Netscape   Microsoft reverse engineered Javascript and called it JScript to avoid trademark issues with Sun   Netscape and Sun were partnered up at the time  so this was less of an issue   The languages are identical  both are dialects of ECMA script  the after-the-fact standard   Although the languages are identical  since JScript runs in Internet Explorer  it has access to different objects exposed by the browser  such as ActiveXObject

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There are some code differences to be aware of   A negative first parameter to subtr is not supported  e g  in Javascript   string  substr -1  returns  g   whereas in JScript   string  substr -1  returns  string   It s possible to do  string  0  to get  s  in Javascript  but JScript doesn t support such a construct   Actually  only modern browsers appear to support the  string  0  construct

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From Wikipedia  http   en wikipedia org wiki Jscript     JScript is the Microsoft dialect of   the ECMAScript scripting language   specification       JavaScript  the Netscape Mozilla   implementation of the ECMA   specification   JScript  and   ECMAScript are very similar languages    In fact the name  JavaScript  is often   used to refer to ECMAScript or   JScript    Microsoft uses the name JScript for its implementation to avoid trademark issues  JavaScript is a trademark of Oracle Corporation

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Just different names for what is really ECMAScript  John Resig has a good explanation   Here s the full version breakdown    IE 6-7 support JScript 5  which is equivalent to ECMAScript 3  JavaScript 1 5  IE 8 supports JScript 6  which is equivalent to ECMAScript 3  JavaScript 1 5 - more bug fixes over JScript 5  Firefox 1 0 supports JavaScript 1 5  ECMAScript 3 equivalent  Firefox 1 5 supports JavaScript 1 6  1 5   Array Extras   E4X   misc   Firefox 2 0 supports JavaScript 1 7  1 6   Generator   Iterators   let   misc   Firefox 3 0 supports JavaScript 1 8  1 7   Generator Expressions   Expression Closures   misc   The next version of Firefox will support JavaScript 1 9  1 8   To be determined  Opera supports a language that is equivalent to ECMAScript 3   Getters and Setters   misc  Safari supports a language that is equivalent to ECMAScript 3   Getters and Setters   misc

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Jscript is a  NET language similar to C   with the same capabilities and access to all the  NET functions    JavaScript is run on the ASP Classic server  Use Classic ASP to run the same JavaScript that you have on the Client  excluding HTML5 capabilities   I only have one set of code this way for most of my code   I run  ASPX JScript when I require Image and Binary File functions   among many others  that are not in Classic ASP  This code is unique for the server  but extremely powerful

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JScript is the Microsoft implementation of Javascript

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According to this article    JavaScript is a scripting language developed by Netscape Communications designed for developing client and server Internet applications  Netscape Navigator is designed to interpret JavaScript embedded into Web pages  JavaScript is independent of Sun Microsystem s Java language   Microsoft JScript is an open implementation of Netscape s JavaScript  JScript is a high-performance scripting language designed to create active online content for the World Wide Web  JScript allows developers to link and automate a wide variety of objects in Web pages  including ActiveX controls and Java programs  Microsoft Internet Explorer is designed to interpret JScript embedded into Web pages

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Wikipedia has this to say about the differences   In general JScript is an ActiveX scripting language that is probably interpreted as JavaScript by non-IE browsers

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JScript is Microsoft s implementation of the ECMAScript specification  JavaScript is the Mozilla implementation of the specification

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JScript is Microsoft s equivalent of JavaScript   Java is an Oracle product and used to be a Sun product   Oracle bought Sun   JavaScript   Microsoft   JScript

[javascript] What's the difference between JavaScript and JScript?

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