?? Operator in TypeScript
"Nullish Coalescing"
If the left operand is null or undefined,
the ?? expression evaluates to the right operand:
null ?? "n/a"
// "n/a"
undefined ?? "n/a"
// "n/a"
Otherwise, the ?? expression evaluates to the left operand:
false ?? true
// false
0 ?? 100
// 0
"" ?? "n/a"
// ""
NaN ?? 0
// NaN
Notice that all left operands above are falsy values.
If we had used the || operator instead of the ?? operator,
all of these expressions would've evaluated to their
respective right operands:
false || true
// true
0 || 100
// 100
"" || "n/a"
// "n/a"
NaN || 0
// 0
Are there any code examples left?
New code examples in category TypeScript
-
TypeScript 2022-03-27 19:30:45 typescript promise
-
TypeScript 2022-03-27 17:25:44 how to search for imports in vscode
-
TypeScript 2022-03-27 17:15:20 angular formgroup mark as touched
-
TypeScript 2022-03-27 17:05:06 use of slice and splice add elements array
-
TypeScript 2022-03-27 16:50:23 android studio loop through all objects in layout
-
TypeScript 2022-03-27 14:35:08 wergensherts meaning
-
TypeScript 2022-03-27 13:50:15 remove all the elements from a numpy array python
-
TypeScript 2022-03-27 12:35:49 redux toolkit typescript install
-
TypeScript 2022-03-27 12:35:30 laravel middleware for apis