Questions tagged [conditional-binding]
13 questions
19
votes
5 answers
Bound value in a conditional binding must be of Optional Type
I have a protocol defined:
protocol Usable {
func use()
}
and a class that conforms to that protocol
class Thing: Usable {
func use () {
println ("you use the thing")
}
}
I would like to programmatically test whether or not the…
JuJoDi
- 14,627
- 23
- 80
- 126
7
votes
1 answer
Contextual bindings with Ninject 2.0
In Ninject 1.0 I had following binding definitions:
Bind().To().Only(When.Context.Variable("variable").EqualTo(true));
Bind().To();
Given such bindings I had calls:
ITarget target =…
Przemaas
- 841
- 11
- 23
5
votes
2 answers
Understanding syntax of closure with no return type
I am getting into swift for the first time here and I have stumbled across a closure statement that doesn't make a whole lot sense to me based off of my current understanding of how closures are written. This is really a two-part question because I…
sanch
- 696
- 1
- 7
- 21
4
votes
6 answers
Conditional variable binding in Common Lisp
I want to execute a function with 2 local variables, but the values of these of these variables should depend on some condition. For example, let's say I have 2 variables x and y, and I want to swap them inside let if y > x. The swap should be…
Mirzhan Irkegulov
- 17,660
- 12
- 105
- 166
3
votes
1 answer
Pattern match and conditionally bind in a single Switch statement
Is there a way to write this if/else if/else ladder as a switch statement?
let x: Any = "123"
if let s = x as? String {
useString(s)
}
else if let i = x as? Int {
useInt(i)
}
else if let b = x as? Bool {
useBool(b)
}
else {
…
Alexander
- 59,041
- 12
- 98
- 151
3
votes
2 answers
Parameter based bindings in ninject 2.0
I want to use conditional binding in ninject, based on passed parameters. I have something like below:
public class Subject
{
}
public interface ITarget
{
}
public class Target1 : ITarget
{
}
public class Target2 : ITarget
{
}
And now I need to…
Przemaas
- 841
- 11
- 23
2
votes
1 answer
Conditional dependency injection binding only when property not null
It is a desktop application which is obliged to impersonate the current user when accessing the underlying data source.
How can I tell Ninject not to bind the dependency until the property of a parent object is not null?
Application forces user…
Will Marcouiller
- 23,773
- 22
- 96
- 162
1
vote
2 answers
Conditionally binding to an existing property
I'm looking for a way to improve this pattern of code:
struct Struct {
let i: Int
init?(i: Int?) {
guard let unwrappedI = i else { return nil }
self.i = unwrappedI
}
}
It'd be nice to remove the unwrappedI temporary…
Alexander
- 59,041
- 12
- 98
- 151
1
vote
2 answers
How do you conditionally bind data?
How do I conditionally bind data to a combo box? I have a combo box that by default should display an ID. However, if the user checks a check box then the display should display both the ID and a NAME. For example, "OO1: Sam". I have the default ID…
GAR8
- 293
- 1
- 5
- 14
0
votes
3 answers
Vue Conditional Class Binding
I am trying to dynamically render class based off actionTypeCreate. This is a method that simply returns a boolean value based off the prop actionType that is passed. I am triggering this method on the mounted hook and confirmed it is returning…
Jeff Domain
- 81
- 1
- 8
0
votes
1 answer
Initializer for conditional binding must have Optional type, not 'String' on HTTPCookieStorage
Not sure why I'm getting this error, but I get it when I updated to Swift 2.
The error is on if let token = cookie.value {
Initializer for conditional binding must have Optional type, not 'String'
func saveAuthToken() {
if let cookies =…
mosaic6
- 923
- 3
- 11
- 18
-1
votes
1 answer
Swift dictionary with assigned nil value can be conditionally bind in if let statement
Can you explain this Swift code
If I assign nil value for "a" key
and then use if let statement this nil value will be unwrapped as nil and can be printed
import Foundation
var dictionary = ["a": nil, "b": "Costam", "c":…
Michał Ziobro
- 10,759
- 11
- 88
- 143
-2
votes
1 answer
Optional Binding (String: AnyObject) to [String]
I have a JSON object/dictionary I retrieved from AFNetworking and I want to conditionally unwrap the key into an array of strings.
var person: [String : AnyObject] = ...
if let interests = person["interests"] as [String]{
// Do something
}
I…
blee908
- 12,165
- 10
- 34
- 41