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  • ?? and ??= operators - null-coalescing operators - C# reference
    The null-coalescing operator ?? returns the value of its left-hand operand if it's not null Otherwise, it evaluates the right-hand operand and returns its result The ?? operator doesn't evaluate its right-hand operand if the left-hand operand evaluates to non-null
  • Nullish coalescing operator (??) - JavaScript - MDN
    The nullish coalescing (??) operator is a logical operator that returns its right-hand side operand when its left-hand side operand is null or undefined, and otherwise returns its left-hand side operand
  • Null coalescing operator - Wikipedia
    It is most commonly written as x ?? y, but varies across programming languages While its behavior differs between implementations, the null coalescing operator generally returns the result of its left-most operand if it exists and is not null, and otherwise returns the right-most operand
  • 空值合并运算符 - JavaScript
    空值合并运算符（nullish coalescing operator）的写法为两个问号 ??。 由于它对待 null 和 undefined 的方式类似，所以在本文中我们将使用一个特殊的术语对其进行表示。 为简洁起见，当一个值既不是 null 也不是 undefined 时，我们将其称为“已定义的（defined）”。
  • C# Null-Conditional (?. ) Null-Coalescing (??) Operators Explained
    The null-conditional operator (? ) lets you safely access members of potentially null objects, while the null-coalescing operator (??) provides a concise way to supply default values when encountering nulls
  • When should I use ?? (nullish coalescing) vs || (logical OR)?
    The OR operator || uses the right value if left is falsy, while the nullish coalescing operator ?? uses the right value if left is null or undefined These operators are often used to provide a default value if the first one is missing
  • Null-Coalescing Operator in C# - GeeksforGeeks
    The null-coalescing operator (??) in C# is used to handle null values efficiently by providing a fallback or default value It returns the value of its left-hand operand if it is not null, otherwise, it evaluates and returns the right-hand operand
  • JavaScript - Nullish Coalescing Operator
    The Nullish Coalescing operator in JavaScript is represented by two question marks (??) It takes two operands and returns the first operand if it is not null or undefined
  • Nullish coalescing operator - The Modern JavaScript Tutorial
    The operator ?? has a very low precedence, only a bit higher than ? and =, so consider adding parentheses when using it in an expression It’s forbidden to use it with || or without explicit parentheses
  • What Is the JavaScript Double Question Marks (??) Operator?
    You’re about to demystify JavaScript’s double question marks (??), also known as the Nullish Coalescing Operator It may seem odd, but it’s extremely handy when working with potential null or undefined values It allows you to use the default value and prevent unexpected code behaviors





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