Bugfix every, and create more top level functions

strudel.mjs

@@ -507,9 +507,10 @@ class Pattern {
     }
 
     every(n, func) {
-        const pats = Array(n-1).fill(this)
-        pats.unshift(func(this))
-        return slowcat(...pats)
+        const pat = this
+        const pats = Array(n-1).fill(pat)
+        pats.unshift(func(pat))
+        return slowcatPrime(...pats)
     }
 
     append(other) {
@@ -593,6 +594,18 @@ function slowcat(...pats) {
     return new Pattern(query)._splitQueries()
 }
 
+function slowcatPrime(...pats) {
+    // Concatenation: combines a list of patterns, switching between them
+    // successively, one per cycle. Unlike slowcat, this version will skip cycles.
+    pats = pats.map(reify)
+    const query = function(span) {
+        const pat_n = Math.floor(span.begin) % pats.length
+        const pat = pats[pat_n]
+        return pat.query(span)
+    }
+    return new Pattern(query)._splitQueries()
+}
+
 function fastcat(...pats) {
     // Concatenation: as with slowcat, but squashes a cycle from each
     // pattern into one cycle
@@ -679,9 +692,20 @@ const slow  = curry((a, pat) => pat.slow(a))
 const early = curry((a, pat) => pat.early(a))
 const late  = curry((a, pat) => pat.late(a))
 const rev   = pat => pat.rev()
+const add   = curry((a, pat) => pat.add(a))
+const sub   = curry((a, pat) => pat.sub(a))
+const mul   = curry((a, pat) => pat.mul(a))
+const div   = curry((a, pat) => pat.div(a))
+const union = curry((a, pat) => pat.union(a))
+const every = curry((i, f, pat) => pat.every(i, f))
+const when  = curry((binary, f, pat) => pat.when(binary, f))
+const off   = curry((t, f, pat) => pat.off(t,f))
+const jux   = curry((f, pat) => pat.jux(f))
+const append = curry((a, pat) => pat.append(a))
 
 export {Fraction, TimeSpan, Hap, Pattern, 
     pure, stack, slowcat, fastcat, cat, timeCat, sequence, polymeter, pm, polyrhythm, pr, reify, silence,
-    fast, slow, early, late, rev
+    fast, slow, early, late, rev,
+    add, sub, mul, div, union, every, when, off, jux, append
 }
 

test/pattern.test.mjs

@@ -2,7 +2,7 @@ import Fraction from 'fraction.js'
 
 import { strict as assert } from 'assert';
 
-import {TimeSpan, Hap, Pattern, pure, stack, fastcat, slowcat, cat, sequence, polyrhythm, silence, fast, timeCat} from "../strudel.mjs";
+import {TimeSpan, Hap, Pattern, pure, stack, fastcat, slowcat, cat, sequence, polyrhythm, silence, fast, timeCat,add,sub,mul,div} from "../strudel.mjs";
 //import { Time } from 'tone';
 import pkg from 'tone';
 const { Time } = pkg;
@@ -221,7 +221,19 @@ describe('Pattern', function() {
       assert.deepStrictEqual(
         pure("a").every(3, fast(2))._fast(3).firstCycle,
         sequence(sequence("a", "a"), "a", "a").firstCycle
-      )      
+      )
+      assert.deepStrictEqual(
+        sequence(3,4,5).every(3, add(3)).fast(5).firstCycle,
+        sequence(6,7,8,3,4,5,3,4,5,6,7,8,3,4,5).firstCycle
+      )
+      assert.deepStrictEqual(
+        sequence(3,4,5).every(2, sub(1)).fast(5).firstCycle,
+        sequence(2,3,4,3,4,5,2,3,4,3,4,5,2,3,4).firstCycle
+      )
+      assert.deepStrictEqual(
+        sequence(3,4,5).every(3, add(3)).every(2, sub(1)).fast(2).firstCycle,
+        sequence(5,6,7,3,4,5).firstCycle
+      )
     })
   })
   describe('timeCat()', function() {