How to compare [String]? and String in Swift? [closed]

up vote
-4
down vote

favorite

When I try to compare [String]? and String I get the error:

Binary operator '!=' cannot be applied to operands of type '[String]?' and 'String'

Could anyone tell me how to compare them?

edited Nov 10 at 5:12

rmaddy

236k27306373

asked Nov 10 at 4:30

Payne Chu

146313

closed as unclear what you're asking by ColGraff, user6655984, TDG, greg-449, Rob Nov 10 at 12:42

Please clarify your specific problem or add additional details to highlight exactly what you need. As it's currently written, it’s hard to tell exactly what you're asking. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

2

You'll have to be more clear on how you want to compare a collection of String to a single String. Do you want to know if any item in the collection is not equal to the single item?
– ColGraff
Nov 10 at 4:42

Just give us an example of what you are trying to do and show the code that gave you this error.
– Rakesha Shastri
Nov 10 at 4:44

Thanks for all you guys effort. Im new in Swift and just got confuse with the "Question Mark". And not realised the one Im comparing actually is an array. Finally understand just need to do like array![0]=="anystring"
– Payne Chu
Nov 11 at 1:53

add a comment |

up vote
-4
down vote

favorite

When I try to compare [String]? and String I get the error:

Binary operator '!=' cannot be applied to operands of type '[String]?' and 'String'

Could anyone tell me how to compare them?

edited Nov 10 at 5:12

rmaddy

236k27306373

asked Nov 10 at 4:30

Payne Chu

146313

closed as unclear what you're asking by ColGraff, user6655984, TDG, greg-449, Rob Nov 10 at 12:42

2

You'll have to be more clear on how you want to compare a collection of String to a single String. Do you want to know if any item in the collection is not equal to the single item?
– ColGraff
Nov 10 at 4:42

Just give us an example of what you are trying to do and show the code that gave you this error.
– Rakesha Shastri
Nov 10 at 4:44

Thanks for all you guys effort. Im new in Swift and just got confuse with the "Question Mark". And not realised the one Im comparing actually is an array. Finally understand just need to do like array![0]=="anystring"
– Payne Chu
Nov 11 at 1:53

add a comment |

up vote
-4
down vote

favorite

When I try to compare [String]? and String I get the error:

Binary operator '!=' cannot be applied to operands of type '[String]?' and 'String'

Could anyone tell me how to compare them?

edited Nov 10 at 5:12

rmaddy

236k27306373

asked Nov 10 at 4:30

Payne Chu

146313

When I try to compare [String]? and String I get the error:

Binary operator '!=' cannot be applied to operands of type '[String]?' and 'String'

Could anyone tell me how to compare them?

swift string compare

edited Nov 10 at 5:12

rmaddy

236k27306373

asked Nov 10 at 4:30

Payne Chu

146313

edited Nov 10 at 5:12

rmaddy

236k27306373

asked Nov 10 at 4:30

Payne Chu

146313

edited Nov 10 at 5:12

rmaddy

236k27306373

edited Nov 10 at 5:12

rmaddy

236k27306373

edited Nov 10 at 5:12

rmaddy

236k27306373

asked Nov 10 at 4:30

Payne Chu

146313

asked Nov 10 at 4:30

Payne Chu

146313

asked Nov 10 at 4:30

Payne Chu

146313

closed as unclear what you're asking by ColGraff, user6655984, TDG, greg-449, Rob Nov 10 at 12:42

2

You'll have to be more clear on how you want to compare a collection of String to a single String. Do you want to know if any item in the collection is not equal to the single item?
– ColGraff
Nov 10 at 4:42

Just give us an example of what you are trying to do and show the code that gave you this error.
– Rakesha Shastri
Nov 10 at 4:44

Thanks for all you guys effort. Im new in Swift and just got confuse with the "Question Mark". And not realised the one Im comparing actually is an array. Finally understand just need to do like array![0]=="anystring"
– Payne Chu
Nov 11 at 1:53

add a comment |

2

You'll have to be more clear on how you want to compare a collection of String to a single String. Do you want to know if any item in the collection is not equal to the single item?
– ColGraff
Nov 10 at 4:42

Just give us an example of what you are trying to do and show the code that gave you this error.
– Rakesha Shastri
Nov 10 at 4:44

Thanks for all you guys effort. Im new in Swift and just got confuse with the "Question Mark". And not realised the one Im comparing actually is an array. Finally understand just need to do like array![0]=="anystring"
– Payne Chu
Nov 11 at 1:53

You'll have to be more clear on how you want to compare a collection of String to a single String. Do you want to know if any item in the collection is not equal to the single item?
– ColGraff
Nov 10 at 4:42

Just give us an example of what you are trying to do and show the code that gave you this error.
– Rakesha Shastri
Nov 10 at 4:44

Thanks for all you guys effort. Im new in Swift and just got confuse with the "Question Mark". And not realised the one Im comparing actually is an array. Finally understand just need to do like array![0]=="anystring"
– Payne Chu
Nov 11 at 1:53

add a comment |

2 Answers
2

active

oldest

votes

up vote
1
down vote

accepted

You can't compare a string with an optional array of strings, they have two different types: The equality operator ==, as defined in the standard library, can't compare a string to an optional array of strings.

If you want to check if an optional array contains a string, then use the following:

let array: [String]? = ["hello", "world", "✋🏻"]
let result = array?.contains("hello")

result would be an optional boolean that you may unwrap later.

answered Nov 10 at 11:26

Carpsen90

6,59062557

add a comment |

up vote
0
down vote

var array = ["First", "Second"]
let loneString = "Second"

for k in 0..<array.count 

 if array[k] != loneString 

 print("they are not same")

edited Nov 11 at 7:42

mrvincenzo

3,39832142

answered Nov 10 at 8:29

Hope

5493828

2

This doesn't even compile (you can't unwrap a string that isn't optional) + array is optional in the question
– Carpsen90
Nov 10 at 11:04

add a comment |

2 Answers
2

active

oldest

votes

2 Answers
2

active

oldest

votes

up vote
1
down vote

accepted

If you want to check if an optional array contains a string, then use the following:

let array: [String]? = ["hello", "world", "✋🏻"]
let result = array?.contains("hello")

result would be an optional boolean that you may unwrap later.

answered Nov 10 at 11:26

Carpsen90

6,59062557

add a comment |

up vote
1
down vote

accepted

If you want to check if an optional array contains a string, then use the following:

let array: [String]? = ["hello", "world", "✋🏻"]
let result = array?.contains("hello")

result would be an optional boolean that you may unwrap later.

answered Nov 10 at 11:26

Carpsen90

6,59062557

add a comment |

up vote
1
down vote

accepted

If you want to check if an optional array contains a string, then use the following:

let array: [String]? = ["hello", "world", "✋🏻"]
let result = array?.contains("hello")

result would be an optional boolean that you may unwrap later.

answered Nov 10 at 11:26

Carpsen90

6,59062557

If you want to check if an optional array contains a string, then use the following:

let array: [String]? = ["hello", "world", "✋🏻"]
let result = array?.contains("hello")

result would be an optional boolean that you may unwrap later.

answered Nov 10 at 11:26

Carpsen90

6,59062557

answered Nov 10 at 11:26

Carpsen90

6,59062557

answered Nov 10 at 11:26

Carpsen90

6,59062557

answered Nov 10 at 11:26

Carpsen90

6,59062557

add a comment |

up vote
0
down vote

var array = ["First", "Second"]
let loneString = "Second"

for k in 0..<array.count 

 if array[k] != loneString 

 print("they are not same")

edited Nov 11 at 7:42

mrvincenzo

3,39832142

answered Nov 10 at 8:29

Hope

5493828

2

This doesn't even compile (you can't unwrap a string that isn't optional) + array is optional in the question
– Carpsen90
Nov 10 at 11:04

add a comment |

up vote
0
down vote

var array = ["First", "Second"]
let loneString = "Second"

for k in 0..<array.count 

 if array[k] != loneString 

 print("they are not same")

edited Nov 11 at 7:42

mrvincenzo

3,39832142

answered Nov 10 at 8:29

Hope

5493828

2

This doesn't even compile (you can't unwrap a string that isn't optional) + array is optional in the question
– Carpsen90
Nov 10 at 11:04

add a comment |

up vote
0
down vote

var array = ["First", "Second"]
let loneString = "Second"

for k in 0..<array.count 

 if array[k] != loneString 

 print("they are not same")

edited Nov 11 at 7:42

mrvincenzo

3,39832142

answered Nov 10 at 8:29

Hope

5493828

var array = ["First", "Second"]
let loneString = "Second"

for k in 0..<array.count 

 if array[k] != loneString 

 print("they are not same")

edited Nov 11 at 7:42

mrvincenzo

3,39832142

answered Nov 10 at 8:29

Hope

5493828

edited Nov 11 at 7:42

mrvincenzo

3,39832142

edited Nov 11 at 7:42

mrvincenzo

3,39832142

edited Nov 11 at 7:42

mrvincenzo

3,39832142

answered Nov 10 at 8:29

Hope

5493828

answered Nov 10 at 8:29

Hope

5493828

answered Nov 10 at 8:29

Hope

5493828

2

This doesn't even compile (you can't unwrap a string that isn't optional) + array is optional in the question
– Carpsen90
Nov 10 at 11:04

add a comment |

2

This doesn't even compile (you can't unwrap a string that isn't optional) + array is optional in the question
– Carpsen90
Nov 10 at 11:04

This doesn't even compile (you can't unwrap a string that isn't optional) + array is optional in the question
– Carpsen90
Nov 10 at 11:04

add a comment |

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