Shorthand for "function" keyword

[Allen Wirfs-Brock]

An idiom that assigns names to arrow functions arguments:



```js
let add, mul; //used to name arrow functions

const sum = [1, 2, 3].reduce(add = (a, b) => a + b);
const product = [1, 2, 3].reduce(mul = (a, b) => a * b);
```





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