Nullish coalescing, javascript new features 2020
Nullish coalescing, javascript 2020
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.
Earlier, when one wanted to assign a default value to a variable, a common pattern was to use the logical OR operator (||)
This works well for the common case of null and undefined values, but there are a number of falsy values that might produce surprising results
The nullary coalescing operator is intended to handle these cases better and serves as an equality check against nullary values (null or undefined).
Supported Browsers
chrome v80 and firefox v72
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