Enforce “for” loop update clause moving the counter in the right direction. (for-direction)

The "extends": "eslint:recommended" property in a configuration file enables this rule.

Rule Details

A for loop with a stop condition that can never be reached, such as one with a counter that moves in the wrong direction, will run infinitely. While there are occasions when an infinite loop is intended, the convention is to construct such loops as while loops. More typically, an infinite for loop is a bug.

Examples of incorrect code for this rule:

/*eslint for-direction: "error"*/
for (var i = 0; i < 10; i--) {
}

for (var i = 10; i >= 0; i++) {
}

Examples of correct code for this rule:

/*eslint for-direction: "error"*/
for (var i = 0; i < 10; i++) {
}

Version

This rule was introduced in ESLint 4.0.0-beta.0.

Resources

• Rule source
• Documentation source