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array joining
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| const num = 100000; | |
| const runs = 100; | |
| function populate<T extends number>(arr: T[], prob: T): T[] { | |
| for (let i = num; i--; ) { | |
| if (Math.random() > prob) { | |
| arr[i] = i as T; | |
| } | |
| } | |
| return arr; | |
| } | |
| const foo = populate([], 0.5); | |
| const bar = populate([], 0.5); | |
| const baz = populate([], 0.5); | |
| const entities = populate([], 0.25); | |
| function* join<T>(ent: T[], ...components: T[][]): IterableIterator<T[]> { | |
| for (let i = ent.length; i--; ) { | |
| if (!ent[i]) continue; | |
| let valid = true; | |
| const result: T[] = []; | |
| for (let j = components.length; j--; ) { | |
| const value = components[j][i]; | |
| valid = value && valid; | |
| if (!valid) break; | |
| result.push(value); | |
| } | |
| if (valid) yield result; | |
| } | |
| return; | |
| } | |
| let startTime = 0, | |
| stopTime = 0, | |
| cumulativeTime = 0, | |
| totalTime = 0; | |
| for (let i = runs; i--; ) { | |
| let count = 0; | |
| startTime = performance.now(); | |
| for (const [f, br, bz] of join(entities, foo, bar, baz)) { | |
| count = f && br && bz ? count + 1 : 0; | |
| } | |
| stopTime = performance.now(); | |
| cumulativeTime += stopTime - startTime; | |
| totalTime += count; | |
| } | |
| console.log("time:", cumulativeTime / runs, totalTime / runs); |
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