noDuplicateCase
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Diagnostic Category: lint/suspicious/noDuplicateCase
Since: v1.0.0
Sources:
- Same as:
no-duplicate-case
Disallow duplicate case labels.
If a switch statement has duplicate test expressions in case clauses, it is likely that a programmer copied a case clause but forgot to change the test expression.
Examples
Section titled ExamplesInvalid
Section titled Invalidswitch (a) { case 1: break; case 1: break; default: break;}code-block.js:4:10 lint/suspicious/noDuplicateCase ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
✖ Duplicate case label.
2 │ case 1:
3 │ break;
> 4 │ case 1:
│ ^
5 │ break;
6 │ default:
ℹ The first similar label is here:
1 │ switch (a) {
> 2 │ case 1:
│ ^
3 │ break;
4 │ case 1:
switch (a) { case one: break; case one: break; default: break;}code-block.js:4:10 lint/suspicious/noDuplicateCase ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
✖ Duplicate case label.
2 │ case one:
3 │ break;
> 4 │ case one:
│ ^^^
5 │ break;
6 │ default:
ℹ The first similar label is here:
1 │ switch (a) {
> 2 │ case one:
│ ^^^
3 │ break;
4 │ case one:
switch (a) { case "1": break; case "1": break; default: break;}code-block.js:4:10 lint/suspicious/noDuplicateCase ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
✖ Duplicate case label.
2 │ case “1”:
3 │ break;
> 4 │ case “1”:
│ ^^^
5 │ break;
6 │ default:
ℹ The first similar label is here:
1 │ switch (a) {
> 2 │ case “1”:
│ ^^^
3 │ break;
4 │ case “1”:
Valid
Section titled Validswitch (a) { case 1: break; case 2: break; default: break;}switch (a) { case one: break; case two: break; default: break;}switch (a) { case "1": break; case "2": break; default: break;}