prefer-for-of.md

Requires for-of statements instead of Array#forEach (prefer-for-of)

ES2015 introduced new for-of syntax. It's more readable than Array#forEach since it does not require closures.

Rule Details

👎 Examples of incorrect code for this rule:

/*eslint prefer-for-of: "error"*/

list.forEach(value => {
    doSomething(value)
})

for (let i = 0; i < list.length; ++i) {
    const value = list[i]
    doSomething(value)
}

for (const i in list) {
    if (obj.hasOwnProperty(i)) {
        doSomething(obj[i])
    }
}

for (const key in obj) {
    doSomething(key, obj[key])
}

👍 Examples of correct code for this rule:

/*eslint prefer-for-of: "error"*/

for (const value of list) {
    doSomething(value)
}

for (const key of Object.keys(obj)) {
    doSomething(key, obj[key])
}

// Allow for indices.
list.forEach((value, index) => {
    doSomething(index, value)
})

Options

Nothing.