Disallow unnecessary computed property keys on objects (no-useless-computed-key)

The --fix option on the command line can automatically fix some of the problems reported by this rule.

It’s unnecessary to use computed properties with literals such as:

var foo = {["a"]: "b"};

The code can be rewritten as:

var foo = {"a": "b"};

Rule Details

This rule disallows unnecessary usage of computed property keys.

Examples

Examples of incorrect code for this rule:

/*eslint no-useless-computed-key: "error"*/
/*eslint-env es6*/

var a = { ['0']: 0 };
var a = { ['0+1,234']: 0 };
var a = { [0]: 0 };
var a = { ['x']: 0 };
var a = { ['x']() {} };

Examples of correct code for this rule:

/*eslint no-useless-computed-key: "error"*/

var c = { 'a': 0 };
var c = { 0: 0 };
var a = { x() {} };
var c = { a: 0 };
var c = { '0+1,234': 0 };

When Not To Use It

If you don’t want to be notified about unnecessary computed property keys, you can safely disable this rule.

Version

This rule was introduced in ESLint 2.9.0.

Resources

• Rule source
• Documentation source