Straightforward definition of currying:

currying is the act of transforming a function that takes multiple arguments at once, in a function that takes each argument one at a time

Which means, going from

```
function f(a, b) {
return a + b;
}
```

to:

```
function f(a) {
return function (b) {
return a + b;
}
}
```

At the calling site, this means going from:

```
f(a, b)
```

to

```
f(a)(b)
```