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

• Rule source
• Documentation source