Update and rename compose.md to compose-functions.md

snippets/compose-functions.md

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+### Compose functions
+
+Use `Array.reduce()` with the spread operator (`...`) to perform right-to-;eft function composition.
+The last (rightmost) function can accept one or more arguments; the remaining functions must be unary.
+
+```js
+const compose = (...fns) => fns.reduce((f, g) => (...args) => f(g(...args)));
+/*
+const add5 = x => x + 5
+const multiply = (x, y) => x * y
+const multiplyAndAdd5 = compose(add5, multiply)
+multiplyAndAdd5(5, 2) -> 15
+*/
+```