It Everyby

// Check if all numbers are positive
numbers := it.Slice([]int{1, 3, 5, 7, 9})
allPositive := it.EveryBy(numbers, func(n int) bool { return n > 0 })
// allPositive: true

numbers = it.Slice([]int{1, -3, 5, 7, 9})
allPositive = it.EveryBy(numbers, func(n int) bool { return n > 0 })
// allPositive: false

// Check if all strings have minimum length
words := it.Slice([]string{"hello", "world", "go", "lang"})
allLongEnough := it.EveryBy(words, func(s string) bool { return len(s) >= 2 })
// allLongEnough: true

allVeryLong := it.EveryBy(words, func(s string) bool { return len(s) >= 5 })
// allVeryLong: false

// Check if all people are adults
type Person struct {
    Name string
    Age  int
}
people := it.Slice([]Person{
    {Name: "Alice", Age: 30},
    {Name: "Bob", Age: 25},
    {Name: "Charlie", Age: 35},
})
allAdults := it.EveryBy(people, func(p Person) bool { return p.Age >= 18 })
// allAdults: true

minors := it.Slice([]Person{
    {Name: "Alice", Age: 30},
    {Name: "Bob", Age: 15},  // Not adult
    {Name: "Charlie", Age: 35},
})
allAdults = it.EveryBy(minors, func(p Person) bool { return p.Age >= 18 })
// allAdults: false

// Check if all numbers are even
numbers = it.Slice([]int{2, 4, 6, 8, 10})
allEven := it.EveryBy(numbers, func(n int) bool { return n%2 == 0 })
// allEven: true

numbers = it.Slice([]int{2, 4, 6, 7, 10})  // 7 is odd
allEven = it.EveryBy(numbers, func(n int) bool { return n%2 == 0 })
// allEven: false

// Check if all strings are lowercase
strings := it.Slice([]string{"hello", "world", "go", "lang"})
allLowercase := it.EveryBy(strings, func(s string) bool { return s == strings.ToLower(s) })
// allLowercase: true

strings = it.Slice([]string{"hello", "World", "go", "lang"})  // "World" has uppercase
allLowercase = it.EveryBy(strings, func(s string) bool { return s == strings.ToLower(s) })
// allLowercase: false

// Empty collection returns true
empty := it.Slice([]int{})
allPositive := it.EveryBy(empty, func(n int) bool { return n > 0 })
// allPositive: true

// Check if all emails are valid
emails := it.Slice([]string{"[email protected]", "[email protected]", "[email protected]"})
allValid := it.EveryBy(emails, func(email string) bool {
    return strings.Contains(email, "@") && strings.Contains(email, ".")
})
// allValid: true

emails = it.Slice([]string{"[email protected]", "invalid-email", "[email protected]"})
allValid = it.EveryBy(emails, func(email string) bool {
    return strings.Contains(email, "@") && strings.Contains(email, ".")
})
// allValid: false