The initial value of the @@iterator
property is the same function object as the initial value of the
entries
method.
The source for this interactive example is stored in a GitHub repository. If you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request.
The source for this interactive example is stored in a GitHub
repository. If you'd like to contribute to the interactive examples project, please
clone https://github.com/mdn/interactive-examples
and send us a pull request.
Syntax
myMap[Symbol.iterator]
Return value
The map iterator function, which is the
entries()
function by default.
Examples
Using [@@iterator]()
const myMap = new Map()
myMap.set('0', 'foo')
myMap.set(1, 'bar')
myMap.set({}, 'baz')
const mapIter = myMap[Symbol.iterator]()
console.log(mapIter.next().value) // ["0", "foo"]
console.log(mapIter.next().value) // [1, "bar"]
console.log(mapIter.next().value) // [Object, "baz"]
Using [@@iterator]() with for..of
const myMap = new Map()
myMap.set('0', 'foo')
myMap.set(1, 'bar')
myMap.set({}, 'baz')
for (const entry of myMap) {
console.log(entry)
}
// ["0", "foo"]
// [1, "bar"]
// [{}, "baz"]
for (const [key, value] of myMap) {
console.log(`${key}: ${value}`)
}
// 0: foo
// 1: bar
// [Object]: baz
Specifications
Specification |
---|
ECMAScript (ECMA-262) The definition of 'Map.prototype[@@iterator]()' in that specification. |
Browser compatibility
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