How to append an array to an array at current index?

Question

I have an array myarray and I am using a for loop to get a few information which I add to myarray. But next time the for-loop runs, I don't want to create a separate index, but instead the 2nd time and so on, I want to append the information to myarray[0].

How do I do that?

var myarray = [String]()

for var j in 0 < 12 {
    // do some stuff
    for var i in 0 ..< 10 {
        let parta = json?["users"][j]["name"].string
        let partb = json?["users"][j]["Lname"].string
        let partc = json?["users"][j]["dob"].string

        myarray.append("\(parta)-\(partb)-\(partc)---")
        // Here when the for loop comes back again (i = 1) , i dont want to make
        // myarray[1] ,  but instead i want myarray[0] ,
        // having value like [parta-partb-partc--parta-partb-partc]
    }
}

Basically what I am trying to do is, append the new name/lname/dob values at myarray[0] without affecting the current value/string at myarray[0].

Just assign the value at 0 index like this :- myarray[0] = json?["name"].string — Mandeep Singh
– Mandeep Singh, Commented Jul 5, 2019 at 6:36
Actually you are going to build a single string rather than an array. — vadian
– vadian, Commented Jul 5, 2019 at 6:38
@MandeepSingh and then how would i put Lname and dob at myarray[0] ?? I am trying to make a long string that shows name,lastname,dob of several people. (In a single string) And then put it at myarray[0] , then similarly get another very long string and put it at myarray[1](with the help of another forloop) — Zyfe3r
– Zyfe3r, Commented Jul 5, 2019 at 6:39

PinkeshGjr · Accepted Answer · 2019-07-05 06:38:55Z

3

You can insert single element and also add array as below.

Swift 5

var myarray = [String]()
myarray.insert("NewElement", at: 0)
myarray.insert(contentsOf: ["First", "Second", "Third"], at: 0)

answered Jul 5, 2019 at 6:38

PinkeshGjr

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Comments

henrik-dmg · Accepted Answer · 2019-07-05 06:42:06Z

1

If I understand your question correctly, you want to create one long string and add the new data always at the beginning of the string. One way to do that would be:

// Store somewhere
var myString = String()

for var i in(0..<10) {

    let parta = json?["name"].string
    let partb = json?["Lname"].string
    let partc = json?["dob"].string

    let newString = "\(parta)-\(partb)-\(partc)---")
    newString.append(myString)
    myString = newString
    // Here when the for loop comes back again (i = 1) , i dont want to make 
    //myarray[1] ,  but instead i want myarray[0] , 
    //having value like [parta-partb-partc--parta-partb-partc]
}

answered Jul 5, 2019 at 6:42

henrik-dmg

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