It is called the Conditional Operator (which is a ternary operator). It has the form of: condition ? value-if-true : value-if-false Think of the ? as “then” and : as “else”. Your code is equivalent to if (max != 0) hsb.s = 255 * delta / max; else hsb.s = 0;
In the particular case of a map the old options were only two: operator[] and insert (different flavors of insert). So I will start explaining those. The operator[] is a find-or-add operator. It will try to find an element with the given key inside the map, and if it exists it will return a reference … Read more
you can find how to do it here. In short it is: public object this[int i] { get { return InnerList[i]; } set { InnerList[i] = value; } } If you only need a getter the syntax in answer below can be used as well (starting from C# 6).
This is called the three-way comparison operator. According to the P0515 paper proposal: There’s a new three-way comparison operator, <=>. The expression a <=> b returns an object that compares <0 if a < b, compares >0 if a > b, and compares ==0 if a and b are equal/equivalent. To write all comparisons for … Read more
It is a unary operator (taking a single argument) that is borrowed from C, where all data types are just different ways of interpreting bytes. It is the “invert” or “complement” operation, in which all the bits of the input data are reversed. In Python, for integers, the bits of the twos-complement representation of the … Read more
It seems wrong to me to set up an if/else statement just to use the else portion… Just negate your condition, and you’ll get the else logic inside the if: if (!(id in tutorTimes)) { … }
This is the C ternary operator (Objective-C is a superset of C): label.frame = (inPseudoEditMode) ? kLabelIndentedRect : kLabelRect; is semantically equivalent to if(inPseudoEditMode) { label.frame = kLabelIndentedRect; } else { label.frame = kLabelRect; } The ternary with no first element (e.g. variable ?: anotherVariable) means the same as (valOrVar != 0) ? valOrVar : … Read more
Java does have a logical XOR operator, it is ^ (as in a ^ b). Apart from that, you can’t define new operators in Java. Edit: Here’s an example: public static void main(String[] args) { boolean[] all = { false, true }; for (boolean a : all) { for (boolean b: all) { boolean c … Read more
The spaceship operator will return 1, 0, or −1 depending on the value of the left argument relative to the right argument. a <=> b := if a < b then return -1 if a = b then return 0 if a > b then return 1 if a and b are not comparable then … Read more
I’m going to assume you want to build a the regex dynamically to contain other words than part1 and part2, and that you want order not to matter. If so you can use something like this: ((^|, )(part1|part2|part3))+$ Positive matches: part1 part2, part1 part1, part2, part3 Negative matches: part1, //with and without trailing spaces. part3, … Read more