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ECMAScript (or ES) is a client-side scripting language specification that is the basis of several programming languages including JavaScript, ActionScript, and JScript. It specifies the core features that a scripting language should provide and how those features should be implemented.

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First released 1997
Developed by Ecma International after the organization adopted JavaScript
Latest stable version ECMAScript 12
Open-source Yes
Used by all websites

Interesting facts

JavaScript was invented by Brendan Eich in 1995, and became an ECMA standard in 1997. ECMA-262 is the official name of the standard. ECMAScript is the official name of the language.

ECMAScript version numbers run from 1 to 7. ECMAScript 4 was never released. 


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