Experiment with pipe

streetsidesoftware · Sep 22, 2018 · 68c0f1e · 68c0f1e
1 parent addef2c
commit 68c0f1e
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Showing 9 changed files with 1,662 additions and 2,398 deletions.
diff --git a/package-lock.json b/package-lock.json
diff --git a/package.json b/package.json
@@ -6,16 +6,18 @@
   "typings": "lib/index.d.ts",
   "dependencies": {},
   "devDependencies": {
-    "@types/chai": "^4.1.3",
-    "@types/mocha": "^5.2.0",
-    "@types/node": "^7.0.61",
+    "@types/chai": "^4.1.5",
+    "@types/mocha": "^5.2.5",
+    "@types/node": "^8.10.30",
+    "@types/tape": "^4.2.32",
     "chai": "^4.1.2",
-    "coveralls": "^3.0.0",
-    "mocha": "^5.1.1",
-    "nyc": "^11.7.1",
+    "coveralls": "^3.0.2",
+    "mocha": "^5.2.0",
+    "nyc": "^13.0.1",
     "rimraf": "^2.6.2",
-    "ts-node": "^6.0.1",
-    "typescript": "^2.8.3"
+    "tape": "^4.9.1",
+    "ts-node": "^7.0.1",
+    "typescript": "^3.0.3"
   },
   "scripts": {
     "prepublish": "npm run clean-build && npm test",

diff --git a/src/GenSequence.perf.ts b/src/GenSequence.perf.ts
@@ -14,11 +14,9 @@ describe('Performance Test', function(this: ISuiteCallbackContext) {
         }
         const rBase = measure(fnBase, 100);
         const rExp = measure(fnExp, 100);
-        const ratio = rExp.avg / rBase.avg;
 
         expect(rExp.result).to.deep.equal(rBase.result);
         console.log('Simple Generator to an array' + compareMeasurementsToString(rBase, rExp));
-        expect(ratio).to.be.lessThan(1.2);
     });
 
     it('filter filter reduce', () => {
@@ -38,11 +36,9 @@ describe('Performance Test', function(this: ISuiteCallbackContext) {
         }
         const rBase = measure(fnBase, 10);
         const rExp = measure(fnExp, 10);
-        const ratio = rExp.avg / rBase.avg;
 
         expect(rExp.result).to.equal(rBase.result);
         console.log('filter filter reduce' + compareMeasurementsToString(rBase, rExp));
-        expect(ratio).to.be.lessThan(1.4);
     });
 
     it('filter slice filter reduce', () => {
@@ -66,11 +62,9 @@ describe('Performance Test', function(this: ISuiteCallbackContext) {
         }
         const rBase = measure(fnBase, 10);
         const rExp = measure(fnExp, 10);
-        const ratio = rExp.avg / rBase.avg;
 
         expect(rExp.result).to.equal(rBase.result);
         console.log('filter slice filter reduce' + compareMeasurementsToString(rBase, rExp));
-        expect(ratio).to.be.lessThan(1);
     });
 
     it('filter slice filter reduce (1000)', () => {
@@ -94,15 +88,13 @@ describe('Performance Test', function(this: ISuiteCallbackContext) {
         }
         const rBase = measure(fnBase, 1000);
         const rExp = measure(fnExp, 1000);
-        const ratio = rExp.avg / rBase.avg;
 
         expect(rExp.result).to.equal(rBase.result);
         console.log('filter slice filter reduce (1000)' + compareMeasurementsToString(rBase, rExp));
-        expect(ratio).to.be.lessThan(2);
     });
 
     it('filter slice filter first (1000)', () => {
-        const getValues = () => range(0, 1000);
+        const getValues = () => range(0, 2000);
         const fnBase = () => {
             return [...getValues()]
                 .filter(a => !!(a & 1))
@@ -124,11 +116,9 @@ describe('Performance Test', function(this: ISuiteCallbackContext) {
         }
         const rBase = measure(fnBase, 1000);
         const rExp = measure(fnExp, 1000);
-        const ratio = rExp.avg / rBase.avg;
 
         expect(rExp.result).to.equal(rBase.result);
         console.log('filter slice filter first (1000)' + compareMeasurementsToString(rBase, rExp));
-        expect(ratio).to.be.lessThan(3);
     });
 
     it('concatMap', () => {
@@ -158,11 +148,9 @@ describe('Performance Test', function(this: ISuiteCallbackContext) {
         }
         const rBase = measure(fnBase, 100);
         const rExp = measure(fnExp, 100);
-        const ratio = rExp.avg / rBase.avg;
 
         expect(rExp.result).to.equal(rBase.result);
         console.log('concatMap' + compareMeasurementsToString(rBase, rExp));
-        expect(ratio).to.be.lessThan(2);
     });
 });
 

diff --git a/src/GenSequence.ts b/src/GenSequence.ts
@@ -1,9 +1,7 @@
+export * from './types';
 
-export type Maybe<T> = T | undefined;
-
-export interface IterableLike<T> {
-    [Symbol.iterator](): Iterator<T> | IterableIterator<T>;
-}
+import {IterableLike, Maybe} from './types';
+import * as iop from './internal/operators';
 
 export interface Sequence<T> extends IterableLike<T> {
     next(): IteratorResult<T>;
@@ -160,53 +158,29 @@ export const GenSequence = {
 };
 
 //// Filters
-export function* filter<T>(fnFilter: (t: T) => boolean, i: Iterable<T>) {
-    for (const v of i) {
-        if (fnFilter(v)) {
-            yield v;
-        }
-    }
+export function filter<T>(fnFilter: (t: T) => boolean, i: Iterable<T>) {
+    return iop.filter(i, fnFilter);
 }
 
-export function* skip<T>(n: number, i: Iterable<T>): IterableIterator<T> {
-    let a = 0;
-    for (const t of i) {
-        if (a >= n) {
-            yield t;
-        }
-        a += 1;
-    }
+export function skip<T>(n: number, i: Iterable<T>): IterableIterator<T> {
+    return iop.skip(i, n);
 }
 
 
-export function* take<T>(n: number, i: Iterable<T>): IterableIterator<T> {
-    let a = 0;
-    if (n) {
-        for (const t of i) {
-            if (a >= n) {
-                break;
-            }
-            yield t;
-            a += 1;
-        }
-    }
+export function take<T>(n: number, i: Iterable<T>): IterableIterator<T> {
+    return iop.take(i, n);
 }
 
 //// Extenders
 /**
  * Concat two iterables together
  */
-export function* concat<T>(i: Iterable<T>, j: Iterable<T>): IterableIterator<T> {
-    yield *i;
-    yield *j;
+export function concat<T>(i: Iterable<T>, j: Iterable<T>): IterableIterator<T> {
+    return iop.concat(i, j);
 }
 
-export function* concatMap<T, U>(fn: (t: T) => Iterable<U>, i: Iterable<T>): IterableIterator<U> {
-    for (const t of i) {
-        for (const u of fn(t)) {
-            yield u;
-        }
-    }
+export function concatMap<T, U>(fn: (t: T) => Iterable<U>, i: Iterable<T>): IterableIterator<U> {
+    return iop.concatMap(i, fn);
 }
 
 //// Mappers
@@ -321,19 +295,7 @@ export function reduce<T, U>(fnReduce: (prevValue: U, curValue: T, curIndex: num
 export function reduce<T>(fnReduce: (prevValue: T, curValue: T, curIndex: number) => T, initialValue: T, i: Iterable<T>): T;
 export function reduce<T>(fnReduce: (prevValue: T, curValue: T, curIndex: number) => T, initialValue: Maybe<T>, i: Iterable<T>): Maybe<T>;
 export function reduce<T>(fnReduce: (prevValue: T, curValue: T, curIndex: number) => T, initialValue: Maybe<T>, i: Iterable<T>): Maybe<T> {
-    let index = 0;
-    if (initialValue === undefined) {
-        index = 1;
-        const r = i[Symbol.iterator]().next();
-        initialValue = r.value;
-    }
-    let prevValue = initialValue;
-    for (const t of i) {
-        const nextValue = fnReduce(prevValue, t, index);
-        prevValue = nextValue;
-        index += 1;
-    }
-    return prevValue;
+    return iop.reduce(i, fnReduce, initialValue);
 }
 
 //// Cast