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Recent JavaScript has many new features that improves developers experience and makes easier to write clean code.
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Unfortunately, all browsers don’t support all new features, specially old versions.
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To still be able to use the new features, developers use “transpilers” than transform modern JavaScript into old JavaScript so old browsers can understand it.
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As a consequence, most of newly written JavaScript is deployed as old JavaScript.
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Developers working on browsers want to make them fast.
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Making a browser fast means making it faster for the most common intensive uses.
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Most common current intensive use of browser is massive JavaScript web applications “transpiled” into old JavaScript.
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Developers working on next generation browsers are spending their time to make them fast when executing next generation JavaScript that has been dumbed down to old JavaScript.
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