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Mutating an array of symbols


Mutating an array of symbols

By : Jayhad
Date : November 22 2020, 04:01 AM
around this issue You convert symbol to string, but you don't assign it and you keep using symbol. Also use map instead of each. A quickfix would be:
code :
s = [:aplha, :beta, :kappa, :phi]

def pluralSym(sym, out = [])
  sym.map! do |s|
    str = s.to_s
    if str.match(/a$/)
      out = str.sub(/a$/, "ae")
    elsif s.match(/i$/)
      out = str.sub(/i$/, "is")
    else
      out = str
    end
    out.to_sym
  end
end


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C++ : Suggest names for mutating and non-mutating versions of a member function

C++ : Suggest names for mutating and non-mutating versions of a member function


By : user2269288
Date : March 29 2020, 07:55 AM
I wish did fix the issue. One option would be to use Scale for the mutating version and ScaleCopy for the non-mutating version, since it returns a copy of the original with the operation performed on the copy.
Another option would be to make the non-mutating version a non-member function. For example,
code :
Image Scale(Image im, double scale_factor) {
    im.Scale(scale_factor);
    return im;
}
Swift 2 Error using mutating function in Protocol extension "Cannot use mutating member on immutable value: 'self'

Swift 2 Error using mutating function in Protocol extension "Cannot use mutating member on immutable value: 'self'


By : Saucy Salamander
Date : March 29 2020, 07:55 AM
This might help you The problem is that, in the protocol you mark the function as mutating, which you need to do if you want to use the protocol on a struct. However, the self that is passed to testFunc is immutable (it's a reference to a instance of the class) and that is tripping up the compiler. This would make sense if testClass was actually a struct and you could make the function mutating to resolve the issue.
I can see two work arounds:
code :
protocol MTKAnimateValueDelegate: class { ...
func testFunc() {
    var animValue = MTKAnimateValue(fromValue: 10, toValue: 20, inSeconds: 2)
    animValue.isAnimating = true
    var mutableSelf = self
    mutableSelf.mtkAnimQueAppend(animValue) 
  }
If I have an array of strings (which include symbols) how can I strip out the elements whose symbols make up non-words?

If I have an array of strings (which include symbols) how can I strip out the elements whose symbols make up non-words?


By : Joe
Date : March 29 2020, 07:55 AM
hop of those help? I have an array that looks like this: , After your clarification, the best I came up with would be:
code :
input.grep(/\A[\p{Alnum}\s]+(\([\p{Alnum}\s]+\))?\z/)
#⇒ [
#  [0] "Welcome",
#  [1] "Occurred",
#  [2] "John (CPA)",
#  [3] "target",
#  [4] "else",
#  [5] "The",
#  [6] "web",
#  [7] "site"
# ]
input.grep(/\A[\p{Alnum}\s]+(\([\p{Alnum}\s]+\))\z/)
#⇒ ["John (CPA)"]
Javascript Delete items from array that exists in another array without mutating for reducers

Javascript Delete items from array that exists in another array without mutating for reducers


By : Cihat Kisa
Date : March 29 2020, 07:55 AM
may help you . I have following two arrays , filter() and some()
code :
let a = ["Hello", "bye", "good morning", "test"],
    b = ["Hello", "test"],
    c = a.filter( e => !b.some( i => i===e))
Converting a mutating array to non-mutating in place

Converting a mutating array to non-mutating in place


By : NIKHIL
Date : March 29 2020, 07:55 AM
Does that help There are no "mutating" and "non-mutating" Arrays. The issue is that you're likely creating a ReversedCollection, and you want an Array. You can create that by creating an Array from the collection:
code :
let array = self.doSomething(Array(Array<UInt8>([10, 29, 33]).reversed()))
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