extra-iterable - npm Package Compare versions

Comparing version 1.0.6 to 1.0.7

index.js

@@ -1,2 +0,59 @@
-// 0. iterable-all (all)
+function is(v) {
+  return v!=null && typeof v[Symbol.iterator]==='function';
+}
+function isCollection(a) {
+  return is(a) && typeof a!=='string';
+}
+function equal(i1, i2) {
+  if(i1===i2) return true;
+  var f2 = i2[Symbol.iterator]();
+  for(var v1 of i1) {
+    var s2 = f2.next();
+    if(v1!=s2.value || s2.done) return false;
+  }
+  return true;
+}
+function size(itr) {
+  var z = 0;
+  if(itr.size!=null) return itr.size;
+  if(itr.length!=null) return itr.length;
+  for(var v of itr)
+    z++;
+  return z;
+}
+function first(itr, idx=0) {
+  var i = -1;
+  for(var v of itr)
+    if(++i===idx) return v;
+}
+function last(itr, idx=-1) {
+  var i = -1, a = [];
+  for(var v of itr)
+    a[++i % idx] = v;
+  return a[++i % idx];
+}
+function middle(itr, idx=0) {
+  return idx<0? last(itr, idx):first(itr, idx);
+}
+function keys(itr) {
+  var i = 0, z = [];
+  for(var v of itr)
+    z.push(i++);
+  return z;
+}
+function entries(itr) {
+  var z = [], i = 0;
+  for(var v of itr)
+    z.push([i++, v]);
+  return z;
+}
+function any(itr, bgn=0, end=Number.MAX_SAFE_INTEGER) {
+  var i = -1;
+  for(var v of itr) {
+    if(++i<bgn) continue;
+    if(i>=end) break;
+    if(v) return true;
+  }
+  return false;
+}
 function all(itr, bgn=0, end=Number.MAX_SAFE_INTEGER) {
@@ -10,5 +67,16 @@ var i = -1;
   return true;
-};
-// 1. iterable-any (any)
-function any(itr, bgn=0, end=Number.MAX_SAFE_INTEGER) {
+}
+function from(a) {
+  if(a==null || typeof a[Symbol.iterator]==='function') return a;
+  return typeof a==='object'? Object.entries(a):[a];
+}
+function startsWith(itr, val) {
+  for(var v of itr)
+    return v===val;
+}
+function endsWith(itr, val) {
+  for(var v of itr);
+  return v===val;
+}
+function indexOf(itr, val, bgn=0, end=Number.MAX_SAFE_INTEGER) {
   var i = -1;
@@ -18,19 +86,25 @@ for(var v of itr) {
     if(i>=end) break;
-    if(v) return true;
+    if(v===val) return i; 
   }
-  return false;
-};
-// 2. iterable-average (average)
-function average(itr, bgn=0, end=Number.MAX_SAFE_INTEGER) {
-  var i = -1, s = 0, n = 0;
+  return -1;
+}
+function indicesOf(itr, val, bgn=0, end=Number.MAX_SAFE_INTEGER, z=[], z0=z.length) {
+  var i = -1;
   for(var v of itr) {
     if(++i<bgn) continue;
     if(i>=end) break;
-    s += v;
-    ++n;
+    if(v===val) z[z0++] = i;
   }
-  return n>0? s/n:0;
-};
-// 3. iterable-compact (compact)
-function compact(itr, bgn=0, end=Number.MAX_SAFE_INTEGER, z=[], z0=z.length) {
+  return z;
+}
+function lastIndexOf(itr, val, bgn=Number.MAX_SAFE_INTEGER, end=-1) {
+  var i = -1, z = -1;
+  for(var v of itr) {
+    if(++i<=end) continue;
+    if(i>bgn) break;
+    if(v===val) z = i;
+  }
+  return z;
+}
+function includes(itr, val, bgn=0, end=Number.MAX_SAFE_INTEGER) {
   var i = -1;
@@ -40,16 +114,6 @@ for(var v of itr) {
     if(i>=end) break;
-    if(v) z[z0++] = v;
+    if(v===val) return true;
   }
-  return z;
-};
-// 4. iterable-concat (concat)
-function concat() {
-  var z = [], z0 = 0;
-  for(var i=0, I=arguments.length; i<I; i++) {
-    for(var v of arguments[i])
-      z[z0++] = v;
-  }
-  return z;
-};
-// 5. iterable-contains (contains)
+  return false;
+}
 function contains(i1, i2) {
@@ -66,46 +130,13 @@ var a2 = Array.from(i2);
   return false;
-};
-// 6. iterable-endswith (endsWith)
-function endsWith(itr, val) {
-  for(var v of itr);
-  return v===val;
-};
-// 7. iterable-entries (entries)
-function entries(itr) {
-  var z = [], i = 0;
-  for(var v of itr)
-    z.push([i++, v]);
-  return z;
-};
-// 8. iterable-equal (equal)
-function equal(i1, i2) {
-  if(i1===i2) return true;
-  var f2 = i2[Symbol.iterator]();
-  for(var v1 of i1) {
-    var s2 = f2.next();
-    if(v1!=s2.value || s2.done) return false;
-  }
-  return true;
-};
-// 9. iterable-euclideandistance (euclideanDistance)
-function euclideanDistance(i1, i2) {
-  var I2 = i2[Symbol.iterator](), z = 0;
-  for(var v1 of i1) {
-    var v2 = I2.next().value;
-    z += (v1-v2)*(v1-v2);
-  }
-  return Math.sqrt(z);
-};
-// 10. iterable-everyof (everyOf)
-function everyOf(itr, fn, ths, bgn=0, end=Number.MAX_SAFE_INTEGER) {
-  var i = -1;
+}
+function join(itr, sep=',', bgn=0, end=Number.MAX_SAFE_INTEGER, z='') {
+  var i = -1, zl0 = z.length;
   for(var v of itr) {
     if(++i<bgn) continue;
     if(i>=end) break;
-    if(!fn.call(ths, v, i, itr)) return false;
+    z += v+sep;
   }
-  return true;
-};
-// 11. iterable-filter (filter)
-function filter(itr, fn, ths, bgn=0, end=Number.MAX_SAFE_INTEGER, z=[], z0=z.length) {
+  return z.length>zl0? z.substring(0, z.length-sep.length):z;
+}
+function pick(itr, idx, bgn=0, end=Number.MAX_SAFE_INTEGER, z=[], z0=z.length) {
   var i = -1;
@@ -115,17 +146,22 @@ for(var v of itr) {
     if(i>=end) break;
-    if(fn.call(ths, v, i, itr)) z[z0++] = v;
+    var ix = idx.indexOf(i);
+    if(ix>=0) z[z0+ix] = v;
   }
   return z;
-};
-// 12. iterable-find (find)
-function find(itr, fn, ths, bgn=0, end=Number.MAX_SAFE_INTEGER) {
-  var i = -1;
+}
+function slice(itr, bgn=0, end=Number.MAX_SAFE_INTEGER, z=[], z0=z.length) {
+  var i = -1, z0 = z0<0? z.length+z0:z0;
   for(var v of itr) {
     if(++i<bgn) continue;
     if(i>=end) break;
-    if(fn.call(ths, v, i, itr)) return v;
+    z[z0++] = v;
   }
-};
-// 13. iterable-findall (findAll)
-function findAll(itr, fn, ths, bgn=0, end=Number.MAX_SAFE_INTEGER, z=[], z0=z.length) {
+  return z;
+}
+function pickAs(itr, idx, bgn=0, end=Number.MAX_SAFE_INTEGER, z=[], z0=z.length) {
+  if(idx==null) return slice(itr, bgn, end, z, z0);
+  if(Array.isArray(idx)) return pick(itr, idx, bgn, end, z, z0);
+  return pick(itr, [idx], bgn, end, z, z0)[z0];
+}
+function compact(itr, bgn=0, end=Number.MAX_SAFE_INTEGER, z=[], z0=z.length) {
   var i = -1;
@@ -135,8 +171,7 @@ for(var v of itr) {
     if(i>=end) break;
-    if(fn.call(ths, v, i, itr)) z[z0++] = v;
+    if(v) z[z0++] = v;
   }
   return z;
-};
-// 14. iterable-findallindices (findAllIndices)
-function findAllIndices(itr, fn, ths, bgn=0, end=Number.MAX_SAFE_INTEGER, z=[], z0=z.length) {
+}
+function without(itr, rmv, bgn=0, end=Number.MAX_SAFE_INTEGER, z=[], z0=z.length) {
   var i = -1;
@@ -146,30 +181,21 @@ for(var v of itr) {
     if(i>=end) break;
-    if(fn.call(ths, v, i, itr)) z[z0++] = i;
+    if(!rmv.has(v)) z[z0++] = v;
   }
   return z;
-};
-// 15. iterable-findindex (findIndex)
-function findIndex(itr, fn, ths, bgn=0, end=Number.MAX_SAFE_INTEGER) {
-  var i = -1;
-  for(var v of itr) {
-    if(++i<bgn) continue;
-    if(i>=end) break;
-    if(fn.call(ths, v, i, itr)) return i;
+}
+function concat() {
+  var z = [], z0 = 0;
+  for(var i=0, I=arguments.length; i<I; i++) {
+    for(var v of arguments[i])
+      z[z0++] = v;
   }
-  return -1;
-};
-// 16. iterable-first (first)
-function first(itr, idx=0) {
-  var i = -1;
-  for(var v of itr)
-    if(++i===idx) return v;
-};
-// 17. iterable-flatten (flatten)
-function flattenAll20(itr, lvl, z, z0) {
+  return z;
+}
+function flattenAll(itr, lvl, z, z0) {
   for(var v of itr) {
-    if(lvl!==0 && is(v)) z0 = flattenAll20(v, lvl-1, z, z0);
+    if(lvl!==0 && is(v)) z0 = flattenAll(v, lvl-1, z, z0);
     else z[z0++] = v;
   }
   return z0;
-};
+}
 function flatten(itr, lvl=-1, bgn=0, end=Number.MAX_SAFE_INTEGER, z=[], z0=z.length) {
@@ -180,33 +206,20 @@ var i = -1;
     if(i>=end) break;
-    if(lvl!==0 && is(v)) z0 = flattenAll20(v, lvl-1, z, z0);
+    if(lvl!==0 && is(v)) z0 = flattenAll(v, lvl-1, z, z0);
     else z[z0++] = v;
   }
   return z;
-};
-// 18. iterable-foreach (forEach)
-function forEach(itr, fn, ths, bgn=0, end=Number.MAX_SAFE_INTEGER) {
-  var i = -1;
+}
+function zip(itr, bgn=0, end=Number.MAX_SAFE_INTEGER, z=[], z0=z.length) {
+  var i = -1, a = 0;
   for(var v of itr) {
     if(++i<bgn) continue;
     if(i>=end) break;
-    fn.call(ths, v, i, itr);
+    var b = z0-1;
+    for(var u of v)
+      (z[++b] = z[b]||[])[a] = u;
+    a++;
   }
-};
-// 19. iterable-from (from)
-function from(a) {
-  if(a==null || typeof a[Symbol.iterator]==='function') return a;
-  return typeof a==='object'? Object.entries(a):[a];
-};
-// 20. iterable-hammingdistance (hammingDistance)
-function hammingDistance(i1, i2) {
-  var I2 = i2[Symbol.iterator](), z = 0;
-  for(var v1 of i1) {
-    V2 = I2.next();
-    if(V2.done) return NaN;
-    if(v1!==V2.value) z++;
-  }
-  return I2.next().done? z:NaN;
-};
-// 21. iterable-includes (includes)
-function includes(itr, val, bgn=0, end=Number.MAX_SAFE_INTEGER) {
+  return z;
+}
+function replaceTo(itr, val, rep, bgn=0, end=Number.MAX_SAFE_INTEGER, z=[], z0=z.length) {
   var i = -1;
@@ -216,8 +229,7 @@ for(var v of itr) {
     if(i>=end) break;
-    if(v===val) return true;
+    z[z0++] = v===val? rep:v;
   }
-  return false;
-};
-// 22. iterable-indexof (indexOf)
-function indexOf(itr, val, bgn=0, end=Number.MAX_SAFE_INTEGER) {
+  return z;
+}
+function mapReplace(itr, map, bgn=0, end=Number.MAX_SAFE_INTEGER, z=[], z0=z.length) {
   var i = -1;
@@ -227,8 +239,7 @@ for(var v of itr) {
     if(i>=end) break;
-    if(v===val) return i; 
+    z[z0++] = map.has(v)? map.get(v):v;
   }
-  return -1;
-};
-// 23. iterable-indicesof (indicesOf)
-function indicesOf(itr, val, bgn=0, end=Number.MAX_SAFE_INTEGER, z=[], z0=z.length) {
+  return z;
+}
+function objectReplace(itr, obj, bgn=0, end=Number.MAX_SAFE_INTEGER, z=[], z0=z.length) {
   var i = -1;
@@ -238,50 +249,56 @@ for(var v of itr) {
     if(i>=end) break;
-    if(v===val) z[z0++] = i;
+    z[z0++] = obj[v]!==undefined? obj[v]:v;
   }
   return z;
-};
-// 24. iterable-is (is)
-function is(v) {
-  return v!=null && typeof v[Symbol.iterator]==='function';
-};
-// 25. iterable-iscollection (isCollection)
-function isCollection(a) {
-  return is(a) && typeof a!=='string';
-};
-// 26. iterable-join (join)
-function join(itr, sep=',', bgn=0, end=Number.MAX_SAFE_INTEGER, z='') {
-  var i = -1, zl0 = z.length;
+}
+function reverseTo(arr, bgn=0, end=arr.length, z=[], z0=z.length) {
+  for(var i=end-1; i>=bgn; i--)
+    z[z0++] = arr[i];
+  return z;
+}
+const arrayReverse = reverseTo;
+function reverse(itr, bgn=0, end=Number.MAX_SAFE_INTEGER, z=[], z0=z.length) {
+  var i = -1, z00 = z0;
   for(var v of itr) {
     if(++i<bgn) continue;
     if(i>=end) break;
-    z += v+sep;
+    z[z0++] = v;
   }
-  return z.length>zl0? z.substring(0, z.length-sep.length):z;
-};
-// 27. iterable-keys (keys)
-function keys(itr) {
-  var i = 0, z = [];
-  for(var v of itr)
-    z.push(i++);
-  return z;
-};
-// 28. iterable-last (last)
-function last(itr, idx=-1) {
-  var i = -1, a = [];
-  for(var v of itr)
-    a[++i % idx] = v;
-  return a[++i % idx];
-};
-// 29. iterable-lastindexof (lastIndexOf)
-function lastIndexOf(itr, val, bgn=Number.MAX_SAFE_INTEGER, end=-1) {
-  var i = -1, z = -1;
+  return arrayReverse(z, z00, z0);
+}
+function split(itr, sep=',', lim=Number.MAX_SAFE_INTEGER, bgn=0, end=Number.MAX_SAFE_INTEGER, z=[], z0=z.length) {
+  var i = -1, zx = [], n = 0;
   for(var v of itr) {
-    if(++i<=end) continue;
-    if(i>bgn) break;
-    if(v===val) z = i;
+    if(++i<bgn) continue;
+    if(i>=end) break;
+    if(n<lim && v!==sep) zx.push(v);
+    else if(zx.length) { z[z0++] = zx; zx = []; n++; }
   }
+  if(zx.length) z[z0++] = zx;
   return z;
-};
-// 30. iterable-mapreplace (mapReplace)
-function mapReplace(itr, map, bgn=0, end=Number.MAX_SAFE_INTEGER, z=[], z0=z.length) {
+}
+function copyTo(arr, bgn=0, end=arr.length, z=[], z0=z.length, z1=z0+(end-bgn)) {
+  if(z1>z.length) z.length = z1;
+  if(arr===z) return z.copyWithin(z0, bgn, end);
+  for(var i=bgn; i<end; i++)
+    z[z0++] = arr[i];
+  return z;
+}
+function sliceTo(arr, bgn=0, end=arr.length, z=[], z0=z.length) {
+  bgn = bgn<0? arr.length+bgn:bgn;
+  end = end<0? arr.length+end:end;
+  end = end>arr.length? arr.length:end;
+  z0 = z0<0? z.length+z0:z0;
+  return copyTo(arr, bgn, end, z, z0);
+}
+const arraySlice = sliceTo;
+function repeat(itr, n=1, bgn=0, end=Number.MAX_SAFE_INTEGER, z=[], z0=z.length) {
+  var iv = slice(itr, bgn, end);
+  for(var i=0; i<n; i++) {
+    arraySlice(iv, 0, iv.length, z, z0);
+    z0 += iv.length;
+  }
+  return z;
+}
+function forEach(itr, fn, ths, bgn=0, end=Number.MAX_SAFE_INTEGER) {
   var i = -1;
@@ -291,8 +308,6 @@ for(var v of itr) {
     if(i>=end) break;
-    z[z0++] = map.has(v)? map.get(v):v;
+    fn.call(ths, v, i, itr);
   }
-  return z;
-};
-// 31. iterable-mapto (mapTo)
-function mapTo(itr, fn, ths, bgn=0, end=Number.MAX_SAFE_INTEGER, z=[], z0=z.length) {
+}
+function someOf(itr, fn, ths, bgn=0, end=Number.MAX_SAFE_INTEGER) {
   var i = -1;
@@ -302,33 +317,24 @@ for(var v of itr) {
     if(i>=end) break;
-    z[z0++] = fn.call(ths, v, i, itr);
+    if(fn.call(ths, v, i, itr)) return true;
   }
-  return z;
-};
-// 32. iterable-max (max)
-function max(itr, bgn=0, end=Number.MAX_SAFE_INTEGER) {
-  var i = -1, z = -Infinity;
+  return false;
+}
+function everyOf(itr, fn, ths, bgn=0, end=Number.MAX_SAFE_INTEGER) {
+  var i = -1;
   for(var v of itr) {
     if(++i<bgn) continue;
     if(i>=end) break;
-    z = v>z? v:z;
+    if(!fn.call(ths, v, i, itr)) return false;
   }
-  return z;
-};
-// 33. iterable-middle (middle)
-const last36 = require('iterable-last');
-function middle(itr, idx=0) {
-  return idx<0? last36(itr, idx):first(itr, idx);
-};
-// 34. iterable-min (min)
-function min(itr, bgn=0, end=Number.MAX_SAFE_INTEGER) {
-  var z = Infinity;
+  return true;
+}
+function find(itr, fn, ths, bgn=0, end=Number.MAX_SAFE_INTEGER) {
+  var i = -1;
   for(var v of itr) {
     if(++i<bgn) continue;
     if(i>=end) break;
-    z = v<z? v:z;
+    if(fn.call(ths, v, i, itr)) return v;
   }
-  return z;
-};
-// 35. iterable-objectreplace (objectReplace)
-function objectReplace(itr, obj, bgn=0, end=Number.MAX_SAFE_INTEGER, z=[], z0=z.length) {
+}
+function findIndex(itr, fn, ths, bgn=0, end=Number.MAX_SAFE_INTEGER) {
   var i = -1;
@@ -338,8 +344,16 @@ for(var v of itr) {
     if(i>=end) break;
-    z[z0++] = obj[v]!==undefined? obj[v]:v;
+    if(fn.call(ths, v, i, itr)) return i;
   }
+  return -1;
+}
+function findAll(itr, fn, ths, bgn=0, end=Number.MAX_SAFE_INTEGER, z=[], z0=z.length) {
+  var i = -1;
+  for(var v of itr) {
+    if(++i<bgn) continue;
+    if(i>=end) break;
+    if(fn.call(ths, v, i, itr)) z[z0++] = v;
+  }
   return z;
-};
-// 36. iterable-pick (pick)
-function pick(itr, idx, bgn=0, end=Number.MAX_SAFE_INTEGER, z=[], z0=z.length) {
+}
+function findAllIndices(itr, fn, ths, bgn=0, end=Number.MAX_SAFE_INTEGER, z=[], z0=z.length) {
   var i = -1;
@@ -349,15 +363,6 @@ for(var v of itr) {
     if(i>=end) break;
-    var ix = idx.indexOf(i);
-    if(ix>=0) z[z0+ix] = v;
+    if(fn.call(ths, v, i, itr)) z[z0++] = i;
   }
   return z;
-};
-// 37. iterable-pickas (pickAs)
-const pick40 = require('iterable-pick');
-function pickAs(itr, idx, bgn=0, end=Number.MAX_SAFE_INTEGER, z=[], z0=z.length) {
-  if(idx==null) return slice(itr, bgn, end, z, z0);
-  if(Array.isArray(idx)) return pick40(itr, idx, bgn, end, z, z0);
-  return pick40(itr, [idx], bgn, end, z, z0)[z0];
-};
-// 38. iterable-reduce (reduce)
+}
 function reduce(itr, fn, acc, bgn=0, end=Number.MAX_SAFE_INTEGER) {
@@ -371,15 +376,4 @@ var i = -1;
   return acc;
-};
-// 39. iterable-repeat (repeat)
-const sliceTo42 = require('array-sliceto');
-function repeat(itr, n=1, bgn=0, end=Number.MAX_SAFE_INTEGER, z=[], z0=z.length) {
-  var iv = slice(itr, bgn, end);
-  for(var i=0; i<n; i++) {
-    sliceTo42(iv, 0, iv.length, z, z0);
-    z0 += iv.length;
-  }
-  return z;
-};
-// 40. iterable-replaceto (replaceTo)
-function replaceTo(itr, val, rep, bgn=0, end=Number.MAX_SAFE_INTEGER, z=[], z0=z.length) {
+}
+function filter(itr, fn, ths, bgn=0, end=Number.MAX_SAFE_INTEGER, z=[], z0=z.length) {
   var i = -1;
@@ -389,63 +383,33 @@ for(var v of itr) {
     if(i>=end) break;
-    z[z0++] = v===val? rep:v;
+    if(fn.call(ths, v, i, itr)) z[z0++] = v;
   }
   return z;
-};
-// 41. iterable-reverse (reverse)
-function reverse(itr, bgn=0, end=Number.MAX_SAFE_INTEGER, z=[], z0=z.length) {
-  var i = -1, z00 = z0;
+}
+function mapTo(itr, fn, ths, bgn=0, end=Number.MAX_SAFE_INTEGER, z=[], z0=z.length) {
+  var i = -1;
   for(var v of itr) {
     if(++i<bgn) continue;
     if(i>=end) break;
-    z[z0++] = v;
+    z[z0++] = fn.call(ths, v, i, itr);
   }
-  return reverseOf1(z, z00, z0);
-};
-// 42. iterable-size (size)
-function size(itr) {
-  var z = 0;
-  if(itr.size!=null) return itr.size;
-  if(itr.length!=null) return itr.length;
-  for(var v of itr)
-    z++;
   return z;
-};
-// 43. iterable-slice (slice)
-function slice(itr, bgn=0, end=Number.MAX_SAFE_INTEGER, z=[], z0=z.length) {
-  var i = -1, z0 = z0<0? z.length+z0:z0;
+}
+function max(itr, bgn=0, end=Number.MAX_SAFE_INTEGER) {
+  var i = -1, z = -Infinity;
   for(var v of itr) {
     if(++i<bgn) continue;
     if(i>=end) break;
-    z[z0++] = v;
+    z = v>z? v:z;
   }
   return z;
-};
-// 44. iterable-someof (someOf)
-function someOf(itr, fn, ths, bgn=0, end=Number.MAX_SAFE_INTEGER) {
-  var i = -1;
+}
+function min(itr, bgn=0, end=Number.MAX_SAFE_INTEGER) {
+  var z = Infinity;
   for(var v of itr) {
     if(++i<bgn) continue;
     if(i>=end) break;
-    if(fn.call(ths, v, i, itr)) return true;
+    z = v<z? v:z;
   }
-  return false;
-};
-// 45. iterable-split (split)
-function split(itr, sep=',', lim=Number.MAX_SAFE_INTEGER, bgn=0, end=Number.MAX_SAFE_INTEGER, z=[], z0=z.length) {
-  var i = -1, zx = [], n = 0;
-  for(var v of itr) {
-    if(++i<bgn) continue;
-    if(i>=end) break;
-    if(n<lim && v!==sep) zx.push(v);
-    else if(zx.length) { z[z0++] = zx; zx = []; n++; }
-  }
-  if(zx.length) z[z0++] = zx;
   return z;
-};
-// 46. iterable-startswith (startsWith)
-function startsWith(itr, val) {
-  for(var v of itr)
-    return v===val;
-};
-// 47. iterable-sum (sum)
+}
 function sum(itr, bgn=0, end=Number.MAX_SAFE_INTEGER) {
@@ -459,76 +423,93 @@ var i = -1, z = 0;
   return z;
-};
-// 48. iterable-without (without)
-function without(itr, rmv, bgn=0, end=Number.MAX_SAFE_INTEGER, z=[], z0=z.length) {
-  var i = -1;
+}
+function average(itr, bgn=0, end=Number.MAX_SAFE_INTEGER) {
+  var i = -1, s = 0, n = 0;
   for(var v of itr) {
     if(++i<bgn) continue;
     if(i>=end) break;
-    if(!rmv.has(v)) z[z0++] = v;
+    s += v;
+    ++n;
   }
-  return z;
-};
-// 49. iterable-zip (zip)
-function zip(itr, bgn=0, end=Number.MAX_SAFE_INTEGER, z=[], z0=z.length) {
-  var i = -1, a = 0;
-  for(var v of itr) {
-    if(++i<bgn) continue;
-    if(i>=end) break;
-    var b = z0-1;
-    for(var u of v)
-      (z[++b] = z[b]||[])[a] = u;
-    a++;
+  return n>0? s/n:0;
+}
+function hammingDistance(i1, i2) {
+  var I2 = i2[Symbol.iterator](), z = 0;
+  for(var v1 of i1) {
+    V2 = I2.next();
+    if(V2.done) return NaN;
+    if(v1!==V2.value) z++;
   }
-  return z;
-};
-exports.all = all;
-exports.any = any;
-exports.average = average;
-exports.compact = compact;
-exports.concat = concat;
-exports.contains = contains;
-exports.endsWith = endsWith;
-exports.entries = entries;
+  return I2.next().done? z:NaN;
+}
+function euclideanDistance(i1, i2) {
+  var I2 = i2[Symbol.iterator](), z = 0;
+  for(var v1 of i1) {
+    var v2 = I2.next().value;
+    z += (v1-v2)*(v1-v2);
+  }
+  return Math.sqrt(z);
+}
+// 1. Datatype methods
+exports.is = is;
+exports.isCollection = isCollection;
+
+// 2. About methods
 exports.equal = equal;
-exports.euclideanDistance = euclideanDistance;
-exports.every = everyOf;
-exports.filter = filter;
-exports.find = find;
-exports.findAll = findAll;
-exports.findAllIndices = findAllIndices;
-exports.findIndex = findIndex;
+exports.size = size;
 exports.first = first;
-exports.flatten = flatten;
-exports.forEach = forEach;
+exports.middle = middle;
+exports.last = last;
+exports.keys = keys;
+exports.entries = entries;
+exports.any = any;
+exports.all = all;
+
+// 3. Generate methods
 exports.from = from;
-exports.hammingDistance = hammingDistance;
-exports.includes = includes;
+
+// 4. Search methods
+exports.startsWith = startsWith;
+exports.endsWith = endsWith;
 exports.indexOf = indexOf;
 exports.indicesOf = indicesOf;
-exports.is = is;
-exports.isCollection = isCollection;
+exports.lastIndexOf = lastIndexOf;
+exports.includes = includes;
+exports.contains = contains;
+
+// 4. Transform methods
 exports.join = join;
-exports.keys = keys;
-exports.last = last;
-exports.lastIndexOf = lastIndexOf;
-exports.mapReplace = mapReplace;
-exports.map = mapTo;
-exports.max = max;
-exports.middle = middle;
-exports.min = min;
-exports.objectReplace = objectReplace;
 exports.pick = pick;
 exports.pickAs = pickAs;
-exports.reduce = reduce;
-exports.repeat = repeat;
+exports.slice = slice;
+exports.compact = compact;
+exports.without = without;
+exports.concat = concat;
+exports.flatten = flatten;
+exports.zip = zip;
+exports.unzip = exports.zip;
 exports.replace = replaceTo;
+exports.mapReplace = mapReplace;
+exports.objectReplace = objectReplace;
 exports.reverse = reverse;
-exports.size = size;
-exports.slice = slice;
+exports.split = split;
+exports.repeat = repeat;
+
+// 5. Functional methods
+exports.forEach = forEach;
 exports.some = someOf;
-exports.split = split;
-exports.startsWith = startsWith;
+exports.every = everyOf;
+exports.find = find;
+exports.findIndex = findIndex;
+exports.findAll = findAll;
+exports.findAllIndices = findAllIndices;
+exports.reduce = reduce;
+exports.filter = filter;
+exports.map = mapTo;
+
+// 5. Evaluate methods
+exports.max = max;
+exports.min = min;
 exports.sum = sum;
-exports.without = without;
-exports.zip = zip;
-exports.unzip = zip;
+exports.average = average;
+exports.hammingDistance = hammingDistance;
+exports.euclideanDistance = euclideanDistance;

package.json

 {
   "name": "extra-iterable",
-  "version": "1.0.6",
+  "version": "1.0.7",
   "description": "Standard utility methods for Iterable.",
@@ -5,0 +5,0 @@ "main": "index.js",

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