JavaScript 类型错误 : cannot read property of undefined

Question

我正在尝试在 Javascript 中创建一个堆栈类，但我不断收到上述错误的变体。我知道是构造函数的问题，但就是找不到问题出在哪里。这是我的类(class):

"use strict"

class Stack {
    constuctor() {
        this.items = [];
    }

    emptyArray() {
        if (this.items === 0) {
            this.error = "The stack is empty";
        }
        return this.error;
    }

    isEmpty() {
        return this.items === 0;
    }

    push(x) {
        return this.items.push(x);
    }

    pop() {
        if (this.items >= 1) {
            return this.items.pop();
        }
        else {
            throw new emptyArray();
        }
    }

    size() {
        return this.items.length;
    }

    peak() {
        let el1 = this.items.pop();
        let el2 = this.items.pop();
        this.items.push(el2);
        this.items.push(el1);
        return el2;
    }
}

new Stack().size();

Answer 1

构造函数拼写错误:

constuctor() {
    this.items = [];
}