collections.go

package main

type Collection []interface{}

func (c Collection) Len() int {
	return len(c)
}

func (c Collection) Swap(i, j int) {
	c[i], c[j] = c[j], c[i]
}

func (c Collection) All(fn func(interface{}) bool) bool {
	for _, v := range c {
		if !fn(v) {
			return false
		}
	}
	return true
}

func (c Collection) Any(fn func(interface{}) bool) bool {
	for _, v := range c {
		if fn(v) {
			return true
		}
	}
	return false
}

func (c Collection) Count(fn func(interface{}) bool) int {
	count := 0
	for _, v := range c {
		if fn(v) {
			count += 1
		}
	}
	return count
}

func (c Collection) Each(fn func(interface{})) {
	for _, v := range c {
		fn(v)
	}
}

func (c Collection) First(fn func(interface{}) bool) interface{} {
	for _, v := range c {
		if fn(v) {
			return v
		}
	}
	return nil
}

func (c Collection) Where(fn func(interface{}) bool) (result Collection) {
	for _, v := range c {
		if fn(v) {
			result = append(result, v)
		}
	}
	return result
}