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Re:Show HN: A resource for drawing complex primitives in Jav... by makepanic on Tuesday September 15, 2015 @04:50PM (#10223099)
You're right, extending the prototype of builtin objects is almost always a bad idea.

See String.prototype.contains → String.prototype.includes because mootools extended the String prototype[1]

[1] - https://developer.mozilla.org/en-US/docs/Web/JavaScript/Refe...

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