I'm trying to create a contacts search function for my project but I'm having a bit of trouble trying to solve it. The function contains 3 parameters: firstname: user first name (string) lastname: user last name (string) searchInput: current text input that the user is searching (string)

it should return true if user is found. If not, return false.

for example:

contactsSearchfilter("John", "Doe", "jo") = true
contactsSearchfilter("John", "Doe", "do") = true
contactsSearchfilter("John", "doe", "John doe") = true
contactsSearchfilter("John", "doe", "john Doe") = true
contactsSearchfilter("John", "doe", "") = true
contactsSearchfilter("John", "doe", "john Doe asdf") = false
contactsSearchfilter("John", "doe", "ohn") = false
contactsSearchfilter("John", "doe", "asdf") = false

contactsSearchFilter:

function contactsSearchFilter(firstname, lastname, searchInput) {
   
}

Any help would be appreciated