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1. setdefault but for JavaScript. setde... setdefault but for JavaScript. setdefault is a function in Python which can be used to get around using a defaultdict. Here I recreate the behavior in JavaScript.

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   const getDefault = (o, key, defaultVal) => key in o ? o[key] : o[key] = defaultVal

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   // Prototype version of above. Allows for usage: o.getDefault(key, def)

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   Object.defineProperty(Object.prototype, "getDefault", {

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     value: function(key, defaultVal) {

2. range function for JavaScript. range... range function for JavaScript. range is a function that's central to Python that I've implemented in JS. Here, it's a generator just like how it is in Python. Works with negative number arguments.

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   function* range(start, stop, step=1) {

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       if(typeof stop === 'undefined') [start, stop] = [0, start]

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       for(let i = start; step > 0 ? i < stop : i > stop; i += step)

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           yield i

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   }