hemanth.hmWhenever I talk about ?? people have asked me the difference between Logical OR (||) vs Nullish coalescing (??) operators, so here is a quick post.
Truth Table for logical OR ||:
LHS || RHS returns either of the truthy value.
| LHS | RHS | Result |
|---|---|---|
| null | 1 | 1 |
| undefined | 1 | 1 |
| 0 | 1 | 1 |
| false | 1 | 1 |
| '' | 1 | 1 |
| `` | 1 | 1 |
| NaN | 1 | 1 |
Truth table for Nullish coalescing ??:
Returns the RHS for "nullish" LHS values.
Else returns RHS.
[nullish -> null or undefined]
| LHS | RHS | Result |
|---|---|---|
| null | 1 | 1 |
| undefined | 1 | 1 |
| 0 | 1 | 0 |
| false | 1 | false |
| '' | 1 | '' |
| `` | 1 | `` |
| NaN | 1 | NaN |
Quick image with more details:
