Finding sum of elements in Swift array

Question

What is the easiest  best  way to find the sum of an array of integers in swift  I have an array called multiples and I would like to know the sum of the multiples

User · Answer

Swift 3  From all the options displayed here  this is the one that worked for me   let arr    6 1 2 3 4 10 11    var sumedArr   arr reduce 0      0    1    print sumedArr

User · Answer

How about the simple way of  for  var i   0  i  lt  n  i       sum   sum   Int multiples i          where n   number of elements in the array

User · Answer

Swift 3 0  i had the same problem  i found on the documentation Apple this solution   let numbers    1  2  3  4  let addTwo   Int  Int  - gt  Int     x  y in x   y   let numberSum   numbers reduce 0  addTwo      numberSum     10   But  in my case i had a list of object  then i needed transform my value of my list   let numberSum   self list map   0 number here   reduce 0    x  y in x   y      this work for me

User · Answer

A possible solution  define a prefix operator for it  Like the reduce       operator as in APL   e g  GNU APL    A bit of a different approach here   Using a protocol en generic type allows us to to use this operator on Double  Float and Int array types   protocol Number       func   l  Self  r  Self  - gt  Self    func - l  Self  r  Self  - gt  Self    func  gt  l  Self  r  Self  - gt  Bool    func  lt  l  Self  r  Self  - gt  Bool    extension Double   Number    extension Float    Number    extension Int      Number     infix operator        func     lt T Number gt   inout left  T  right  T       left   left   right    prefix operator        prefix func     lt T Number gt  ar  T    - gt  T        switch true           case ar    nil          return nil      case ar  isEmpty          return nil      default          var result   ar  0          for n in 1   lt ar  count                       result    ar  n                    return result          use like so   let nmbrs     12 4  35 6  456 65  43 45   let intarr    1  34  23  54  56  -67  0  44     nmbrs        548 1   intarr       145    updated for Swift 2 2  tested in Xcode Version 7 3

User · Answer

Swift3 has changed to     let multiples         sum   multiples reduce 0

User · Answer

For sum of elements in array of Objects  self rankDataModelArray flatMap  0 count  reduce 0

User · Answer

Swift 3  If you have an array of generic objects and you want to sum some object property then   class A  NSObject       var value   0     init value  Int           self value   value          let array    A value  2   A value  4         let sum   array reduce 0     0    1 value                                                                      0 result   1 next A object print sum     6    Despite of the shorter form  many times you may prefer the classic for-cycle   let array    A value  2   A value  4   var sum   0 array forEach   sum     0 value       or for element in array      sum    element value

User · Answer

Swift 3  one liner to sum properties of objects   var totalSum   scaleData map   0 points   reduce 0       Where points is the property in my custom object scaleData that I am trying to reduce

User · Answer

For me  it was like  this using property       let blueKills   match blueTeam participants reduce 0     result  participant  - gt  Int in         result   participant kills

User · Answer

In Swift 4 You can also constrain the sequence elements to Numeric protocol to return the sum of all elements in the sequence as follow extension Sequence where Element  Numeric           Returns the sum of all elements in the collection     func sum   - gt  Element   return reduce 0           edit update  Xcode 10 2     Swift 5 or later We can simply constrain the sequence elements to the new AdditiveArithmetic protocol to return the sum of all elements in the collection extension Sequence where Element  AdditiveArithmetic       func sum   - gt  Element           return reduce  zero               Xcode 11     Swift 5 1 or later extension Sequence where Element  AdditiveArithmetic       func sum   - gt  Element   reduce  zero           let numbers    1 2 3  numbers sum         6  let doubles    1 5  2 7  3 0  doubles sum         7 2  To sum a property of a custom object we can extend Sequence to take a predicate to return a value that conforms to AdditiveArithmetic  extension Sequence        func sum lt T  AdditiveArithmetic gt    predicate   Element  - gt  T  - gt  T   reduce  zero     0   predicate  1          Usage  struct Product       let id  String     let price  Decimal    let products   Product      init id   quot abc quot   price  21 9                               init id   quot xyz quot   price  19 7                               init id   quot jkl quot   price  2 9     products sum   price      44 5

User · Answer

this is my approach about this  however I believe that the best solution is the answer from the user username tbd  var i   0  var sum   0 let example   0 for elements in multiples      i   i   1     sum   multiples   i- 1       example   sum   example

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Swift 4 example  class Employee       var salary  Int    0     init    salary  Int           self salary   salary          let employees    Employee 100  Employee 300  Employee 600   var sumSalary   employees reduce 0    0    1 salary     1000

User · Answer

This also works    let arr    1 2 3 4 5 6 7 8 9 10  var sumedArr   arr reduce 0  combine    0    1   print sumedArr    The result will be  55

User · Answer

This is the easiest shortest method I can find   Swift 3 and Swift 4   let multiples         let sum   multiples reduce 0     print  Sum of Array is      sum    Swift 2   let multiples         sum   multiples reduce 0  combine         Some more info   This uses Array s reduce method  documentation here   which allows you to  reduce a collection of elements down to a single value by recursively applying the provided closure   We give it 0 as the initial value  and then  essentially  the closure    0    1    Of course  we can simplify that to a single plus sign  because that s how Swift rolls

User · Answer

IBOutlet var valueSource   MultipleIntBoundSource    private var allFieldsCount  Int       var sum   0     valueSource forEach   sum     0 count       return sum     used this one for nested parameters

User · Answer

Keep it simple     var array    1  2  3  4  5  6  7  9  0  var n   0 for i in array       n    i   print  My sum of elements is    n      Output      My sum of elements is  37

[arrays] Finding sum of elements in Swift array

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