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I'm tempted to lie and say that English is my second language, but the truth is that I just have no idea what 'Coalescing' means. I know what ?? 'does' in C#, but the name doesn't make sense to me.
I looked up the word and I understand it to be a synonym for 'join'. 'Null Join Operator' still doesn't make sense.
Can someone enlighten me?
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In computer science, coalescing is a part of memory management in which two adjacent free blocks of computer memory are merged. When a program no longer requires certain blocks of memory, these blocks of memory can be freed.
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.
operator is known as Null-coalescing operator. It will return the value of its left-hand operand if it is not null. If it is null, then it will evaluate the right-hand operand and returns its result. Or if the left-hand operand evaluates to non-null, then it does not evaluate its right-hand operand.
In cases where a statement could return null, the null-coalescing operator can be used to ensure a reasonable value gets returned. This code returns the name of an item or the default name if the item is null. As you can see, this operator is a handy tool when working with the null-conditional operator.
I'm tempted to lie and say that English is my second language...but the truth is that I just have no idea what 'Coalescing' means. I know what ?? 'does' in C#, but the name doesn't make sense to me.
I looked up the word and I understand it to be a synonym for 'join'.
I'd say a more accurate description of "coalesce" would be "to form one thing from different elements". The "coalescing" of the ?? operator happens because a single value is always resolved from one of the two values. The first non-null value is the result.
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