remove an index number from array-CodePudding

I have this code and the task is to write a function that remove the same index number in the function parameter

func deleteElementInArray(arr: [Int], index: Int) -> [Int] {

    var inde = index
    var array = arra[inde]
    var result = array.remove(at: inde) // I got error here Value of type 'Int' has 
                                           //no member 'remove'
    return result

}

sample output

arr [-3 , 4 , 0]

index 0

output [4 , 0]

CodePudding user response：

You are calling the remove function on the Int value at the given index, not on the array:

func deleteElementInArray(arr: [Int], index: Int) -> [Int] {
    // make a mutable copy of the array
    var array = arr
    // remove the item at given index
    array.remove(at: index)
    // return the array  
    return array
}

CodePudding user response：

    var array = arra[inde]
    var result = array.remove(at: inde) // I got error here Value of type 'Int' has

The compiler has described the problem. Int is a standard data type. array is assigned to Int - which has no member called remove. You are probably trying to define

var array:[Int] = [2, 3, 5, 7, 11, 13, 17]
 
array.remove(at: 3)

You are trying to do - array=arra

Note the difference between an array of Int, and an Int.

CodePudding user response：

As others have stated, you wrote your code to try to remove an item from an Integer that you extracted from your array.

You can use the same name for a local var that you use for the input parameter. That works because the new variable is defined at a different scope. Adding an error check so you don't crash if you call it with a bad array index, your function could be rewritten like this:

func deleteElementInArray(array: [Int], index: Int) -> [Int] {
    var array = array
    if array.indices.contains(index) {
        array.remove(at: index)
    }
    return array
}

Note that the Array function remove(at:) already does what you want (excluding the error checking). Ok, `remove(at:) modifies the array in place, where your function creates a mutable copy and modifies that.)