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noNegationElse

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Diagnostic Category: lint/style/noNegationElse

Since: v1.0.0

Sources:

Disallow negation in the condition of an if statement if it has an else clause.

if (!cond) { f();} else { g();}
code-block.js:1:1 lint/style/noNegationElse  FIXABLE  ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

Invert blocks when performing a negation test.

> 1 │ if (!cond) { f();} else { g();}
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
2 │

Safe fix: Invert the condition and the blocks.

1 - if·(!cond)·{·f();}·else·{·g();}
1+ if·(cond)·{·g();}·else·{·f();}
2 2

!cond ? 0 : 1
code-block.js:1:1 lint/style/noNegationElse  FIXABLE  ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

Invert blocks when performing a negation test.

> 1 │ !cond ? 0 : 1
^^^^^^^^^^^^^
2 │

Safe fix: Invert the condition and the blocks.

1 - !cond·?·0·:·1
1+ cond·?·1·:·0
2 2

if (!cond) { f(); }
cond ? 1 : 0
if (!cond) { f(); }
if (!!val) { f(); } else { g(); }