get a value from array inside another array-CodePudding

i have this input

let teachersInfo: [[String]] = [
      ["names", "comments"],
      ["Ian", ",scientist,male, no_available"],
      ["Mark", "teacher,elementary school,female, available_for_new"],
      ["Bryan", "interior designer,male,no_available"],
      ["Tomas", "profesional surfer,master"],
      ["Justine", "no_available, scientist"],
      ["Malek", "teacher, elementary school, available_for_new"],
      ["Adrian", "scientist, profesional surfer, available_for_new"],  
      ["Mike", "elementary schoole,male,no_available"]
    ]

how can i make a funtions that returns

func findTeachersSkills() -> [String] {
        // TODO: return all names that are profesional surfer
        
        
     
        return []
    }

the names from the whoever is a profesional surfer

then get the names from whoever is teacher and have available_for_new

CodePudding user response：

First of all, your sample data does not contain the result which fits all your conditions so I add one item into it

let teachersInfo: [[String]] = [
    ["names", "comments"],
    ["Ian", ",scientist,male, no_available"],
    ["Mark", "teacher,elementary school,female, available_for_new"],
    ["Bryan", "interior designer,male,no_available"],
    ["Tomas", "profesional surfer,master"],
    ["Justine", "no_available, scientist"],
    ["Malek", "teacher, elementary school, available_for_new"],
    ["Adrian", "scientist, profesional surfer, available_for_new"],
    ["Mike", "elementary schoole,male,no_available"],
    ["Johan", "teacher, profesional surfer, available_for_new"]
]

And for your question, it can divide into two task: get the list which is fit all your conditions and get the name of it. From your array we can notice that at index 0 is the name and all others are at index 1

Code will be like this

func findTeachersSkills(_ teachersInfo: [[String]]) -> [String] {
    // TODO: return all names that are profesional surfer
    // get teacher info which is a profesional surfer
    let listTeacherInfoIsProfesionalSurfer = teachersInfo.filter{$0[1].contains("profesional surfer")}
    
    // get teacher info which is teacher and have available_for_new
    let listTeacherInfoIsTeacher = listTeacherInfoIsProfesionalSurfer.filter{$0[1].contains("teacher") && $0[1].contains("available_for_new")}
    
    // Bacause name in index 0 so return it
    return listTeacherInfoIsTeacher.map{$0[0]}
}

We can combine all into one filter like this

func findTeachersSkills(_ teachersInfo: [[String]]) -> [String] {
    // TODO: return all names that are profesional surfer
    // get teacher info which is a profesional surfer
    // get teacher info which is teacher and have available_for_new
    let listTeacherInfoIsTeacher = teachersInfo.filter{$0[1].contains("profesional surfer") && $0[1].contains("teacher") && $0[1].contains("available_for_new")}
    
    // Bacause name in index 0 so return it
    return listTeacherInfoIsTeacher.map{$0[0]}
}

The result is

let finalResult = findTeachersSkills(teachersInfo) // ["Johan"]