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I was wondering if there is a way in javascript to have logic similar to the coalesce statement in sql which will return data in a specified order like this:
Select top 1 Coalesce(ColA, ColB, "No Data Found") from TableA;
is there an elegant way to deal with null values in Javascript, the same way that sql returns results in the above statement?
i know i could technically have a switch statement, but this would require some possibly unnecessary code
Thank you.
322
JavaScript made sure this can be handled with its nullish operator also known as the Null Coalescing Operator, which was added to the language with ECMAScript 2020. With it, you can either return a value or assign it to some other value, depending on a boolean expression.
The SQL server's Coalesce function is used to handle the Null values. The null values are replaced with user-defined values during the expression evaluation process. This function evaluates arguments in a particular order from the provided arguments list and always returns the first non-null value.
The COALESCE function returns the first non-NULL value from a series of expressions. The expressions are evaluated in the order in which they are specified, and the result of the function is the first value that is not null. The result of the COALESCE function returns NULL only if all the arguments are null.
You can use an OR.
var someVar = null || value;
var otherVar = null || variableThatEvaluatesToNull || functionThatEvaluatesToNull() || value;
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