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Its features include exponentiation operator ** for numbers, await, async keywords for asynchronous programming (as a preparation for ES2017), and the Array.prototype.includes function. [5] The exponentiation operator is equivalent to Math.pow , but provides a simpler syntax similar to languages like Python, F#, Perl, and Ruby.
Polyfills create new features for older environments that lack them. Polyfills do this at runtime in the interpreter, such as the user's browser or on the server. Instead, transpiling rewrites the ECMA code itself during the build phase of development before it reaches the interpreter.
GNU Guile features an ECMAScript interpreter as of version 1.9; iv, ECMAScript Lexer / Parser / Interpreter / VM / method JIT written in C++. [9] CL-JavaScript: Can compile JavaScript to machine language on Common Lisp implementations that compile to machine language. [10]
This merge brought V8 ES6 features into Node.js and started a long-term support release cycle. [25] By 2016, the io.js website recommended returning to Node.js and announced no further io.js releases, effectively ending the fork and solidifying the merger's success. [26]
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The other major module specification in use is the ECMAScript (ES) modules specification (ES6 modules aka ES2015 modules). [2] CommonJS can be recognized by the use of the require() function and module.exports, while ES modules use import and export statements for similar (though not identical) functionality.
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