Functional pipeline

htdocs/util.mjs

@@ -1,3 +1,8 @@
+export const comp = (...fs) => x0 => fs.reduceRight((x, f) => f(x), x0);
+export const flow = (...fs) => x0 => fs.reduce((x, f) => f(x), x0);
+export const pipe = (x0, ...fs) => fs.reduce((x, f) => f(x), x0);
+export const aflow = (f0, ...fs) => async (...args) => fs.reduce((x, f) => f(x), await f0(...args));
+
 export function uniq(xs) {
 	var seen = {};
 	return xs.filter(x => seen.hasOwnProperty(x) ? false : (seen[x] = true));