itorator for of

itorator for of 的实现

class Iterator {
    constructor (container) {
        this.list = container.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)
    }
}

let container = new Container([1, 2, 3, 4, 5])
let iterator = container.getIterator()
while (iterator.hasNext()) {
    console.log(iterator.next())
}

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