はてなブックマーク

Mozilla, politics, economics, law, backpacking, cycling, and other random desiderata tl;dr Ideally you shouldn’t use eval, because it inhibits many optimizations and makes code run slower. new Function(argname1, argname2, ..., code) doesn’t inhibit optimizations, so it’s a better way to dynamically generate code. (This may require passing in arguments instead of using names for local variables. Th

Mozilla, politics, economics, law, backpacking, cycling, and other random desiderata tl;dr Don’t try to use the arguments or caller properties of functions created in strict mode code. Don’t try to use the callee or caller properties of arguments objects corresponding to invocations of functions in strict mode code. Don’t try to use the caller property of a function if it might be called from stri

Mozilla, politics, economics, law, backpacking, cycling, and other random desiderata tl;dr We’ve removed support for a handful of obsolete getter/setter syntaxes in SpiderMonkey and Mozilla. This does not include { get property() { return "value"; }, set property(v) { } }, which is widely used and which is part of the latest standard. If you don’t get any syntax errors with your code, you don’t ne