What is the most common mistake in a bind polyfill interview?
Not storing this. Inside the returned function, this is not the original function. You must store it before returning: const fn = this. Then use fn.call(context) inside the returned function.
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More FAQs in bind Polyfill Common Mistakes
Because this inside the returned function is different from this inside myBind. Store it: const fn = this. Use fn in the returned function. Without this, the polyfill cannot call the original function.
Because arrow functions do not have their own this. The instanceof check (this instanceof boundFn) would not work with arrows. Use a regular function for the returned function.
The original function would not receive the arguments passed when the bound function is called. For greet.myBind(obj, 'Hello')('!'), the '!' would be lost. Always spread laterArgs: fn.call(context, ...presetArgs, ...laterArgs).
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