~~~
class Iterator {
constructor(conatiner) {
this.list = conatiner.list
this.index = 0
}
next() {
if (this.hasNext()) {
return this.list[this.index++]
}
return null
}
hasNext() {
if (this.index >= this.list.length) {
return false
}
return true
}
}
class Container {
constructor(list) {
this.list = list
}
getIterator() {
return new Iterator(this)
}
}
// 測試代碼
let container = new Container([1, 2, 3, 4, 5])
let iterator = container.getIterator()
while(iterator.hasNext()) {
console.log(iterator.next())
}
~~~
