promise stuff

all.js

import cast from 'cast'

/**
 * @param {*} values
 * @return {Promise}
 * @resolve {*}
 * @reject {Error}
**/
export default function all (values) {
	return new Promise(function (resolve, reject) {
		var counter = 0
		var result = []
		
		promises
			.map(cast)
			.forEach(handle)
		
		function handle (promise, index) {
			promise.then(push, reject)
			
			function push (value) {
				result[index] = value
				if (++counter === promises.length) {
					resolve(result)
				}
			}
		}
	})
}

cast.js

import is from 'is'
import resolve from 'resolve'

/**
 * @param {*} value
 * @return {Promise}
 * @resolve {*}
**/
export default function cast (value) {
	return is(value) ? value : resolve(value)
}

is.js

/**
 * @param {*} value
 * @return {Boolean}
**/
export default function is (value) {
	return value instanceof Promise
}

race.js

/**
 * @param {Array<*>} values
 * @return {Promise}
 * @resolve {*}
 * @reject {Error}
**/
export default function race (values) {
	return new Promise(function (resolve, reject) {
		values
			.map(cast)
			.forEach(handle)
			
		function handle (promise) {
			promise.then(resolve, reject)
		}
	})
}

reject.js

/**
 * @param {Error} reason
 * @return {Promise}
 * @reject {Error}
**/
export default function reject (reason) {
	return new Promise(function (_, reject) {
		reject(reason)
	})
}

resolve.js

/**
 * @param {*} value
 * @return {Promise}
 * @resolve {*}
**/
export default function resolve (value) {
	return new Promise(function (resolve) {
		resolve(value)
	})	
}

some.js

import cast from 'cast'

export default function some (values, number) {
	return new Promise(function (resolve, reject) {
		var counter = 0
		var result = []

		values
			.map(cast)
			.forEach(handle)

		function handle (promise) {
			promise.then(push, reject)
		}

		function push (value) {
			result.push(value)

			if (++counter === number) resolve(result)
		}
	})
}