Instruction: Define currying and illustrate its use with a JavaScript function.
Context: This question tests the candidate's knowledge of functional programming concepts within JavaScript, specifically currying, and its application in creating highly reusable code.
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To clarify, let's consider an example to exemplify currying in action. Imagine we have a simple multiplication function that takes two arguments. In a curried version, instead of taking both arguments at once, the function takes the first argument and returns a new function that expects the next argument. Here’s how this could be implemented in JavaScript:
```javascript function multiply(a) { return function(b) { return a * b; }; }...