Created
July 17, 2019 17:27
default params as a form of "let binding"
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/* I've been thinking about default params a bit. And how you can use earlier params as values in the default params. | |
It's a nice way to write functions without introducing any variable declaration statements in the body */ | |
const greaterThan = num1 => num2 => num1 < num2; | |
const not = fn => (...args) => !fn(...args); | |
const quickSort = ( | |
nums, | |
pivot = nums[Math.floor(Math.random() * nums.length)], | |
left = nums.filter(not(greaterThan(pivot))), | |
right = nums.filter(greaterThan(pivot)), | |
done = new Set(nums).size <= 1 | |
) => (done ? nums : [...quickSort(left), ...quickSort(right)]); | |
const filterWith = fn => ( | |
[first, ...rest], | |
acc = [], | |
passes = fn(first), | |
next = passes ? acc.concat(first) : acc | |
) => (rest.length === 0 ? next : filterWith(fn)(rest, next)); | |
const GCD = ( | |
num1, | |
num2, | |
larger = Math.max(num1, num2), | |
smaller = Math.min(num2, num2), | |
remainder = larger % smaller | |
) => (remainder === 0 ? smaller : GCD(larger, remainder)); | |
const mapWith = fn => ([first, ...rest], acc = [], mapped = fn(first)) => | |
rest.length === 0 ? [...acc, mapped] : mapWith(fn)(rest, [...acc, mapped]); |
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