Mixing
Loop over array and return TRUE if value exists
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I would like to iterate over an array and if a value exists, I would like to return TRUE.
struct Loops {
var loopStep: LoopStep
}
struct LoopStep {
var template: [Template]
}
struct Template {
var stepType: String
}
let templates: [Template] = [Template(stepType: "FORM_ONE"), Template(stepType: "FORM_TWO")]
let loopStep = LoopStep(template: templates)
let incompleteSteps = [Loops(loopStep: loopStep)]
I have tried this using reduce however cannot make this syntax work
let result = incompleteSteps.reduce(true, $0.loopStep.template.stepType == "FORM_ONE" )
arrays swift
asked Jan 3 at 8:57
Harry BlueHarry Blue
838927
add a comment |
I would like to iterate over an array and if a value exists, I would like to return TRUE.
struct Loops {
var loopStep: LoopStep
}
struct LoopStep {
var template: [Template]
}
struct Template {
var stepType: String
}
let templates: [Template] = [Template(stepType: "FORM_ONE"), Template(stepType: "FORM_TWO")]
let loopStep = LoopStep(template: templates)
let incompleteSteps = [Loops(loopStep: loopStep)]
I have tried this using reduce however cannot make this syntax work
let result = incompleteSteps.reduce(true, $0.loopStep.template.stepType == "FORM_ONE" )
arrays swift
asked Jan 3 at 8:57
Harry BlueHarry Blue
838927
3
Why not simply usecontains(where:)? – Compare stackoverflow.com/questions/29679486/…
– Martin R
Jan 3 at 9:01
2
Offtopic: If you got fixed values, you should use an enum. That way, it will be a lot easier :)
– J. Doe
Jan 3 at 9:02
1
Unrelated: Avoid plurals in struct and class names :Loopinstead ofLoops
– ielyamani
Jan 3 at 9:06
add a comment |
I would like to iterate over an array and if a value exists, I would like to return TRUE.
struct Loops {
var loopStep: LoopStep
}
struct LoopStep {
var template: [Template]
}
struct Template {
var stepType: String
}
let templates: [Template] = [Template(stepType: "FORM_ONE"), Template(stepType: "FORM_TWO")]
let loopStep = LoopStep(template: templates)
let incompleteSteps = [Loops(loopStep: loopStep)]
I have tried this using reduce however cannot make this syntax work
let result = incompleteSteps.reduce(true, $0.loopStep.template.stepType == "FORM_ONE" )
arrays swift
asked Jan 3 at 8:57
Harry BlueHarry Blue
838927
I would like to iterate over an array and if a value exists, I would like to return TRUE.
struct Loops {
var loopStep: LoopStep
}
struct LoopStep {
var template: [Template]
}
struct Template {
var stepType: String
}
let templates: [Template] = [Template(stepType: "FORM_ONE"), Template(stepType: "FORM_TWO")]
let loopStep = LoopStep(template: templates)
let incompleteSteps = [Loops(loopStep: loopStep)]
I have tried this using reduce however cannot make this syntax work
let result = incompleteSteps.reduce(true, $0.loopStep.template.stepType == "FORM_ONE" )
arrays swift
arrays swift
asked Jan 3 at 8:57
Harry BlueHarry Blue
838927
asked Jan 3 at 8:57
Harry BlueHarry Blue
838927
asked Jan 3 at 8:57
Harry BlueHarry Blue
838927
asked Jan 3 at 8:57
Harry BlueHarry Blue
838927
asked Jan 3 at 8:57
Harry BlueHarry Blue
838927
838927
3
Why not simply usecontains(where:)? – Compare stackoverflow.com/questions/29679486/…
– Martin R
Jan 3 at 9:01
2
Offtopic: If you got fixed values, you should use an enum. That way, it will be a lot easier :)
– J. Doe
Jan 3 at 9:02
1
Unrelated: Avoid plurals in struct and class names :Loopinstead ofLoops
– ielyamani
Jan 3 at 9:06
add a comment |
3
Why not simply usecontains(where:)? – Compare stackoverflow.com/questions/29679486/…
– Martin R
Jan 3 at 9:01
2
Offtopic: If you got fixed values, you should use an enum. That way, it will be a lot easier :)
– J. Doe
Jan 3 at 9:02
1
Unrelated: Avoid plurals in struct and class names :Loopinstead ofLoops
– ielyamani
Jan 3 at 9:06
3
3
Why not simply use
contains(where:) ? – Compare stackoverflow.com/questions/29679486/…– Martin R
Jan 3 at 9:01
Why not simply use
contains(where:) ? – Compare stackoverflow.com/questions/29679486/…– Martin R
Jan 3 at 9:01
2
2
Offtopic: If you got fixed values, you should use an enum. That way, it will be a lot easier :)
– J. Doe
Jan 3 at 9:02
Offtopic: If you got fixed values, you should use an enum. That way, it will be a lot easier :)
– J. Doe
Jan 3 at 9:02
1
1
Unrelated: Avoid plurals in struct and class names :
Loop instead of Loops– ielyamani
Jan 3 at 9:06
Unrelated: Avoid plurals in struct and class names :
Loop instead of Loops– ielyamani
Jan 3 at 9:06
add a comment |
1 Answer
1
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oldest
votes
You simply need to use contains(where:) to get a bool return value indicating whether an element matching a closure exists in the collection or not. Since template is an Array itself as well, you actually need to nest two contains(where:) calls if you want to find out if an array of Loops contains any Loops whose template array contains a Template with the matching requirement.
let result = incompleteSteps.contains(where: {$0.loopStep.template.contains(where: {$0.stepType == "FORM_ONE"})})
answered Jan 3 at 9:01
Dávid PásztorDávid Pásztor
23k83152
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
You simply need to use contains(where:) to get a bool return value indicating whether an element matching a closure exists in the collection or not. Since template is an Array itself as well, you actually need to nest two contains(where:) calls if you want to find out if an array of Loops contains any Loops whose template array contains a Template with the matching requirement.
let result = incompleteSteps.contains(where: {$0.loopStep.template.contains(where: {$0.stepType == "FORM_ONE"})})
answered Jan 3 at 9:01
Dávid PásztorDávid Pásztor
23k83152
add a comment |
You simply need to use contains(where:) to get a bool return value indicating whether an element matching a closure exists in the collection or not. Since template is an Array itself as well, you actually need to nest two contains(where:) calls if you want to find out if an array of Loops contains any Loops whose template array contains a Template with the matching requirement.
let result = incompleteSteps.contains(where: {$0.loopStep.template.contains(where: {$0.stepType == "FORM_ONE"})})
answered Jan 3 at 9:01
Dávid PásztorDávid Pásztor
23k83152
add a comment |
You simply need to use contains(where:) to get a bool return value indicating whether an element matching a closure exists in the collection or not. Since template is an Array itself as well, you actually need to nest two contains(where:) calls if you want to find out if an array of Loops contains any Loops whose template array contains a Template with the matching requirement.
let result = incompleteSteps.contains(where: {$0.loopStep.template.contains(where: {$0.stepType == "FORM_ONE"})})
answered Jan 3 at 9:01
Dávid PásztorDávid Pásztor
23k83152
You simply need to use contains(where:) to get a bool return value indicating whether an element matching a closure exists in the collection or not. Since template is an Array itself as well, you actually need to nest two contains(where:) calls if you want to find out if an array of Loops contains any Loops whose template array contains a Template with the matching requirement.
let result = incompleteSteps.contains(where: {$0.loopStep.template.contains(where: {$0.stepType == "FORM_ONE"})})
answered Jan 3 at 9:01
Dávid PásztorDávid Pásztor
23k83152
answered Jan 3 at 9:01
Dávid PásztorDávid Pásztor
23k83152
answered Jan 3 at 9:01
Dávid PásztorDávid Pásztor
23k83152
answered Jan 3 at 9:01
Dávid PásztorDávid Pásztor
23k83152
23k83152
add a comment |
add a comment |
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3
Why not simply use
contains(where:)? – Compare stackoverflow.com/questions/29679486/…– Martin R
Jan 3 at 9:01
2
Offtopic: If you got fixed values, you should use an enum. That way, it will be a lot easier :)
– J. Doe
Jan 3 at 9:02
1
Unrelated: Avoid plurals in struct and class names :
Loopinstead ofLoops– ielyamani
Jan 3 at 9:06