eslint/docs/rules/no-negated-condition.md

   1 # disallow negated conditions (no-negated-condition)
   2
   3 Negated conditions are more difficult to understand. Code can be made more readable by inverting the condition instead.
   4
   5 ## Rule Details
   6
   7 This rule disallows negated conditions in either of the following:
   8
   9 * `if` statements which have an `else` branch
  10 * ternary expressions
  11
  12 Examples of **incorrect** code for this rule:
  13
  14 ```js
  15 /*eslint no-negated-condition: "error"*/
  16
  17 if (!a) {
  18     doSomething();
  19 } else {
  20     doSomethingElse();
  21 }
  22
  23 if (a != b) {
  24     doSomething();
  25 } else {
  26     doSomethingElse();
  27 }
  28
  29 if (a !== b) {
  30     doSomething();
  31 } else {
  32     doSomethingElse();
  33 }
  34
  35 !a ? c : b
  36 ```
  37
  38 Examples of **correct** code for this rule:
  39
  40 ```js
  41 /*eslint no-negated-condition: "error"*/
  42
  43 if (!a) {
  44     doSomething();
  45 }
  46
  47 if (!a) {
  48     doSomething();
  49 } else if (b) {
  50     doSomething();
  51 }
  52
  53 if (a != b) {
  54     doSomething();
  55 }
  56
  57 a ? b : c
  58 ```