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disallow negated conditions (no-negated-condition)

Negated conditions are more difficult to understand. Code can be made more readable by inverting the condition instead.

Rule Details

This rule disallows negated conditions in either of the following:

  • if statements which have an else branch
  • ternary expressions

Examples of incorrect code for this rule:

/*eslint no-negated-condition: "error"*/

if (!a) {
    doSomething();
} else {
    doSomethingElse();
}

if (a != b) {
    doSomething();
} else {
    doSomethingElse();
}

if (a !== b) {
    doSomething();
} else {
    doSomethingElse();
}

!a ? c : b

Examples of correct code for this rule:

/*eslint no-negated-condition: "error"*/

if (!a) {
    doSomething();
}

if (!a) {
    doSomething();
} else if (b) {
    doSomething();
}

if (a != b) {
    doSomething();
}

a ? b : c

Version

This rule was introduced in ESLint 1.6.0.

Resources

© JS Foundation and other contributors
Licensed under the MIT License.
https://eslint.org/docs/rules/no-negated-condition