How to skip return value in function where value is expected
3
This is the function I am using:
let values = (0..<self.data.count).map { (i) -> ChartDataEntry in
let x = valueDate!.timeIntervalSince(startDate)
if let a = (self.data[i]["labelvalue"] as? NSString)?.doubleValue{
return ChartDataEntry(x: Double(x), y: a)
} else {
return nil
}
}
This is causing this error:
Nil is incompatible with return type 'ChartDataEntry'
How can I skip the loop without returning any value and continue with next check?
swift return
edited Nov 13 '18 at 10:36
Dávid Pásztor
20.7k72547
asked Nov 13 '18 at 10:33
sddsdd
429625
add a comment |
3
This is the function I am using:
let values = (0..<self.data.count).map { (i) -> ChartDataEntry in
let x = valueDate!.timeIntervalSince(startDate)
if let a = (self.data[i]["labelvalue"] as? NSString)?.doubleValue{
return ChartDataEntry(x: Double(x), y: a)
} else {
return nil
}
}
This is causing this error:
Nil is incompatible with return type 'ChartDataEntry'
How can I skip the loop without returning any value and continue with next check?
swift return
edited Nov 13 '18 at 10:36
Dávid Pásztor
20.7k72547
asked Nov 13 '18 at 10:33
sddsdd
429625
3
use compactMap instead.
– SeanLintern88
Nov 13 '18 at 10:36
add a comment |
3
3
3
This is the function I am using:
let values = (0..<self.data.count).map { (i) -> ChartDataEntry in
let x = valueDate!.timeIntervalSince(startDate)
if let a = (self.data[i]["labelvalue"] as? NSString)?.doubleValue{
return ChartDataEntry(x: Double(x), y: a)
} else {
return nil
}
}
This is causing this error:
Nil is incompatible with return type 'ChartDataEntry'
How can I skip the loop without returning any value and continue with next check?
swift return
edited Nov 13 '18 at 10:36
Dávid Pásztor
20.7k72547
asked Nov 13 '18 at 10:33
sddsdd
429625
This is the function I am using:
let values = (0..<self.data.count).map { (i) -> ChartDataEntry in
let x = valueDate!.timeIntervalSince(startDate)
if let a = (self.data[i]["labelvalue"] as? NSString)?.doubleValue{
return ChartDataEntry(x: Double(x), y: a)
} else {
return nil
}
}
This is causing this error:
Nil is incompatible with return type 'ChartDataEntry'
How can I skip the loop without returning any value and continue with next check?
swift return
swift return
edited Nov 13 '18 at 10:36
Dávid Pásztor
20.7k72547
asked Nov 13 '18 at 10:33
sddsdd
429625
edited Nov 13 '18 at 10:36
Dávid Pásztor
20.7k72547
asked Nov 13 '18 at 10:33
sddsdd
429625
edited Nov 13 '18 at 10:36
Dávid Pásztor
20.7k72547
edited Nov 13 '18 at 10:36
Dávid Pásztor
20.7k72547
edited Nov 13 '18 at 10:36
Dávid Pásztor
20.7k72547
20.7k72547
asked Nov 13 '18 at 10:33
sddsdd
429625
asked Nov 13 '18 at 10:33
sddsdd
429625
asked Nov 13 '18 at 10:33
sddsdd
429625
429625
3
use compactMap instead.
– SeanLintern88
Nov 13 '18 at 10:36
add a comment |
3
use compactMap instead.
– SeanLintern88
Nov 13 '18 at 10:36
3
3
use compactMap instead.
– SeanLintern88
Nov 13 '18 at 10:36
use compactMap instead.
– SeanLintern88
Nov 13 '18 at 10:36
add a comment |
2 Answers
2
active
oldest
votes
2
let values = (0..<self.data.count).compactMap { (i) -> ChartDataEntry? in
let x = valueDate!.timeIntervalSince(startDate)
if let a = (self.data[i]["labelvalue"] as? NSString)?.doubleValue{
return ChartDataEntry(x: Double(x), y: a)
}
return nil
}
Replace your code with this.
compactMap - Returns an array containing the non-nil results of calling the given transformation with each element of this sequence.
You can read more about compactMap here
edited Nov 13 '18 at 10:50
Ahmad F
16.1k104080
answered Nov 13 '18 at 10:36
AakashAakash
1,343715
Thank you it worked!
– sdd
Nov 13 '18 at 10:44
@sdd can u pls mark the answer if the answer is helpful to you? thanks.
– Aakash
Nov 13 '18 at 10:51
add a comment |
0
Based on the correct answer of Aakash to use compactMap this is a swiftier (and more efficient) version
xis a constant, so create it once outside of the closure.
TimeIntervalis a type alias ofDouble,Double(x)is redundant.- (Compact)map the
dataarray, not its indices. - Avoid unnecessary bridge casts.
let x = valueDate!.timeIntervalSince(startDate)
let values = self.data.compactMap { (item) -> ChartDataEntry? in
guard let d = item["labelvalue"] as? String, let a = Double(d) else { return nil }
return ChartDataEntry(x: x, y: a)
}
answered Nov 13 '18 at 10:56
vadianvadian
144k13154170
add a comment |
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
2
let values = (0..<self.data.count).compactMap { (i) -> ChartDataEntry? in
let x = valueDate!.timeIntervalSince(startDate)
if let a = (self.data[i]["labelvalue"] as? NSString)?.doubleValue{
return ChartDataEntry(x: Double(x), y: a)
}
return nil
}
Replace your code with this.
compactMap - Returns an array containing the non-nil results of calling the given transformation with each element of this sequence.
You can read more about compactMap here
edited Nov 13 '18 at 10:50
Ahmad F
16.1k104080
answered Nov 13 '18 at 10:36
AakashAakash
1,343715
Thank you it worked!
– sdd
Nov 13 '18 at 10:44
@sdd can u pls mark the answer if the answer is helpful to you? thanks.
– Aakash
Nov 13 '18 at 10:51
add a comment |
2
let values = (0..<self.data.count).compactMap { (i) -> ChartDataEntry? in
let x = valueDate!.timeIntervalSince(startDate)
if let a = (self.data[i]["labelvalue"] as? NSString)?.doubleValue{
return ChartDataEntry(x: Double(x), y: a)
}
return nil
}
Replace your code with this.
compactMap - Returns an array containing the non-nil results of calling the given transformation with each element of this sequence.
You can read more about compactMap here
edited Nov 13 '18 at 10:50
Ahmad F
16.1k104080
answered Nov 13 '18 at 10:36
AakashAakash
1,343715
Thank you it worked!
– sdd
Nov 13 '18 at 10:44
@sdd can u pls mark the answer if the answer is helpful to you? thanks.
– Aakash
Nov 13 '18 at 10:51
add a comment |
2
2
2
let values = (0..<self.data.count).compactMap { (i) -> ChartDataEntry? in
let x = valueDate!.timeIntervalSince(startDate)
if let a = (self.data[i]["labelvalue"] as? NSString)?.doubleValue{
return ChartDataEntry(x: Double(x), y: a)
}
return nil
}
Replace your code with this.
compactMap - Returns an array containing the non-nil results of calling the given transformation with each element of this sequence.
You can read more about compactMap here
edited Nov 13 '18 at 10:50
Ahmad F
16.1k104080
answered Nov 13 '18 at 10:36
AakashAakash
1,343715
let values = (0..<self.data.count).compactMap { (i) -> ChartDataEntry? in
let x = valueDate!.timeIntervalSince(startDate)
if let a = (self.data[i]["labelvalue"] as? NSString)?.doubleValue{
return ChartDataEntry(x: Double(x), y: a)
}
return nil
}
Replace your code with this.
compactMap - Returns an array containing the non-nil results of calling the given transformation with each element of this sequence.
You can read more about compactMap here
edited Nov 13 '18 at 10:50
Ahmad F
16.1k104080
answered Nov 13 '18 at 10:36
AakashAakash
1,343715
edited Nov 13 '18 at 10:50
Ahmad F
16.1k104080
edited Nov 13 '18 at 10:50
Ahmad F
16.1k104080
edited Nov 13 '18 at 10:50
Ahmad F
16.1k104080
16.1k104080
answered Nov 13 '18 at 10:36
AakashAakash
1,343715
answered Nov 13 '18 at 10:36
AakashAakash
1,343715
answered Nov 13 '18 at 10:36
AakashAakash
1,343715
1,343715
Thank you it worked!
– sdd
Nov 13 '18 at 10:44
@sdd can u pls mark the answer if the answer is helpful to you? thanks.
– Aakash
Nov 13 '18 at 10:51
add a comment |
Thank you it worked!
– sdd
Nov 13 '18 at 10:44
@sdd can u pls mark the answer if the answer is helpful to you? thanks.
– Aakash
Nov 13 '18 at 10:51
Thank you it worked!
– sdd
Nov 13 '18 at 10:44
Thank you it worked!
– sdd
Nov 13 '18 at 10:44
@sdd can u pls mark the answer if the answer is helpful to you? thanks.
– Aakash
Nov 13 '18 at 10:51
@sdd can u pls mark the answer if the answer is helpful to you? thanks.
– Aakash
Nov 13 '18 at 10:51
add a comment |
0
Based on the correct answer of Aakash to use compactMap this is a swiftier (and more efficient) version
xis a constant, so create it once outside of the closure.
TimeIntervalis a type alias ofDouble,Double(x)is redundant.- (Compact)map the
dataarray, not its indices. - Avoid unnecessary bridge casts.
let x = valueDate!.timeIntervalSince(startDate)
let values = self.data.compactMap { (item) -> ChartDataEntry? in
guard let d = item["labelvalue"] as? String, let a = Double(d) else { return nil }
return ChartDataEntry(x: x, y: a)
}
answered Nov 13 '18 at 10:56
vadianvadian
144k13154170
add a comment |
0
Based on the correct answer of Aakash to use compactMap this is a swiftier (and more efficient) version
xis a constant, so create it once outside of the closure.
TimeIntervalis a type alias ofDouble,Double(x)is redundant.- (Compact)map the
dataarray, not its indices. - Avoid unnecessary bridge casts.
let x = valueDate!.timeIntervalSince(startDate)
let values = self.data.compactMap { (item) -> ChartDataEntry? in
guard let d = item["labelvalue"] as? String, let a = Double(d) else { return nil }
return ChartDataEntry(x: x, y: a)
}
answered Nov 13 '18 at 10:56
vadianvadian
144k13154170
add a comment |
0
0
0
Based on the correct answer of Aakash to use compactMap this is a swiftier (and more efficient) version
xis a constant, so create it once outside of the closure.
TimeIntervalis a type alias ofDouble,Double(x)is redundant.- (Compact)map the
dataarray, not its indices. - Avoid unnecessary bridge casts.
let x = valueDate!.timeIntervalSince(startDate)
let values = self.data.compactMap { (item) -> ChartDataEntry? in
guard let d = item["labelvalue"] as? String, let a = Double(d) else { return nil }
return ChartDataEntry(x: x, y: a)
}
answered Nov 13 '18 at 10:56
vadianvadian
144k13154170
Based on the correct answer of Aakash to use compactMap this is a swiftier (and more efficient) version
xis a constant, so create it once outside of the closure.
TimeIntervalis a type alias ofDouble,Double(x)is redundant.- (Compact)map the
dataarray, not its indices. - Avoid unnecessary bridge casts.
let x = valueDate!.timeIntervalSince(startDate)
let values = self.data.compactMap { (item) -> ChartDataEntry? in
guard let d = item["labelvalue"] as? String, let a = Double(d) else { return nil }
return ChartDataEntry(x: x, y: a)
}
answered Nov 13 '18 at 10:56
vadianvadian
144k13154170
answered Nov 13 '18 at 10:56
vadianvadian
144k13154170
answered Nov 13 '18 at 10:56
vadianvadian
144k13154170
answered Nov 13 '18 at 10:56
vadianvadian
144k13154170
144k13154170
add a comment |
add a comment |
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3
use compactMap instead.
– SeanLintern88
Nov 13 '18 at 10:36