Created
December 13, 2016 17:05
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Fun with generators
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| function* gen(param) { | |
| if (!Array.isArray(param)) | |
| yield param; | |
| else | |
| for (let item of param) | |
| yield* gen(item); | |
| } | |
| function* genNumbers(iterable) { | |
| var items = gen(iterable); | |
| for (let item of items) | |
| if ( typeof item === 'number' && !isNaN(item)) | |
| yield item; | |
| } | |
| function* genEvenNumbers(iterable) { | |
| var numbers = genNumbers(iterable); | |
| for (let num of numbers) | |
| if (num % 2 === 0) | |
| yield num; | |
| } | |
| function* genOddNumbers(iterable) { | |
| var numbers = genNumbers(iterable); | |
| for (let num of numbers) | |
| if (num % 2 !== 0) | |
| yield num; | |
| } | |
| function genGenerator(assert) { | |
| return function* generator(iterable) { | |
| var items = gen(iterable); | |
| for (let item of items) | |
| if (assert(item)) | |
| yield item; | |
| } | |
| } | |
| function sumArray(arr) { | |
| let sum = 0; | |
| const numbersIterator = genNumbers(arr); | |
| for (let number of numbersIterator) | |
| sum += number; | |
| return sum; | |
| } | |
| function averageArray(arr) { | |
| return sumArray(arr) / arr.length; | |
| } | |
| function test() { | |
| var arr = [1,2,3,'done', 4,5, [6,7],[8,[9,[10]],'hello']]; | |
| var numbersIterator = genNumbers(arr); | |
| for (let number of numbersIterator) { | |
| console.log(number); | |
| } | |
| var genLessThen8 = genGenerator(item => item < 8); | |
| for (let number of genLessThen8(arr)) { | |
| console.log(number); | |
| } | |
| } | |
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