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

   1 ---
   2 title: no-negated-condition
   3 layout: doc
   4 rule_type: suggestion
   5 ---
   6
   7
   8 Negated conditions are more difficult to understand. Code can be made more readable by inverting the condition instead.
   9
  10 ## Rule Details
  11
  12 This rule disallows negated conditions in either of the following:
  13
  14 * `if` statements which have an `else` branch
  15 * ternary expressions
  16
  17 Examples of **incorrect** code for this rule:
  18
  19 ::: incorrect
  20
  21 ```js
  22 /*eslint no-negated-condition: "error"*/
  23
  24 if (!a) {
  25     doSomething();
  26 } else {
  27     doSomethingElse();
  28 }
  29
  30 if (a != b) {
  31     doSomething();
  32 } else {
  33     doSomethingElse();
  34 }
  35
  36 if (a !== b) {
  37     doSomething();
  38 } else {
  39     doSomethingElse();
  40 }
  41
  42 !a ? c : b
  43 ```
  44
  45 :::
  46
  47 Examples of **correct** code for this rule:
  48
  49 ::: correct
  50
  51 ```js
  52 /*eslint no-negated-condition: "error"*/
  53
  54 if (!a) {
  55     doSomething();
  56 }
  57
  58 if (!a) {
  59     doSomething();
  60 } else if (b) {
  61     doSomething();
  62 }
  63
  64 if (a != b) {
  65     doSomething();
  66 }
  67
  68 a ? b : c
  69 ```
  70
  71 :::