Lexicographer Erin McKean offers this as a nice example of the power of metaphor. If you were giving a talk about JavaScript to a general audience, you could explain that people often have a mental model of a computer program as being a set of instructions, executed one after another. But in JavaScript, instructions can be asynchronous, which means that you can’t be confident that line five will always happen after line four. Imagine if you were getting dressed in the morning and it was possible to put your shoes on before your jeans (or your jeans on before your underpants)! That can happen
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