add iso hybrid system

package.json

@@ -1,6 +1,6 @@
 {
   "name": "gb-util",
-  "version": "1.0.1",
+  "version": "1.0.2",
   "description": "GB standard tool library",
   "main": "lib/index.js",
   "types": "lib/index.d.ts",

src/ISO_7064.ts

@@ -26,26 +26,46 @@ export function computePure(
   }
   return alphabet[c];
 }
+// from: https://github.com/LiosK/cdigit
+export function computeHybrid(ds: string, alphabet: string): string {
+  const mod = alphabet.length;
+  const charmap = getCharMap(alphabet);
+
+  let c = mod;
+  for (let i = 0, len = ds.length; i < len; i += 1) {
+    c = (c % (mod + 1)) + charmap[ds[i]];
+    c = (c % mod || mod) * 2;
+  }
+  c %= mod + 1;
+
+  return alphabet[(mod + 1 - c) % mod];
+}
 
 const N = '0123456789';
 const A = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
-
+// Pure systems
 export function mod11_2(num: string): string {
   return computePure(num, 11, 2, false, N + 'X');
 }
-
 export function mod37_2(num: string): string {
   return computePure(num, 37, 2, false, N + A + '*');
 }
-
 export function mod97_10(num: string): string {
   return computePure(num, 97, 10, true, N);
 }
-
 export function mod661_26(num: string): string {
   return computePure(num, 661, 26, true, A);
 }
-
 export function mod1271_36(num: string): string {
   return computePure(num, 1271, 36, true, N + A);
 }
+// Hybrid systems
+export function mod11_10(ds: string): string {
+  return computeHybrid(ds, N);
+}
+export function mod27_26(ds: string): string {
+  return computeHybrid(ds, A);
+}
+export function mod37_36(ds: string): string {
+  return computeHybrid(ds, N + A);
+}

src/__tests__/ISO_7064.ts

@@ -16,3 +16,13 @@ test('mod1271_36', () => {
   expect(alg.mod1271_36('ISO79')).toBe('3W');
   expect(alg.mod1271_36('ZZZZZZZZZZZZZZZZ')).toBe('UU');
 });
+
+test('mod11_10', () => {
+  expect(alg.mod11_10('0794')).toBe('5');
+});
+test('mod27_26', () => {
+  expect(alg.mod27_26('JEJLMGJ')).toBe('S');
+});
+test('mod37_36', () => {
+  expect(alg.mod37_36('B7Q3SFTUSH2QN7BIXBPMNZAM')).toBe('I');
+});