Different writing process with a business scenario

Written 1

/ * * 
* Object method, self-executing functions, closures 
* / 
const buildTask = (() => {
     var Queue1 = [];
     return { 
        Push (ITEM1) { 
            queue1.push (ITEM1); 
            the console.log (Queue1) ; 
        } 
    } 
}) (); 
const RES1 = buildTask.push (. 1 ); 
the console.log (RES1);

Writing 2

/ * * 
* Self-executing functions, closures 
* / 
const buildTask2 = (() => {
     var Queue2 = [];
     return (ITEM2) => { 
        queue2.push (ITEM2); 
        the console.log (Queue2); 
    } 
} ) (); 
const RES2 = buildTask2 (. 1 ); 
the console.log (RES2);

Written 3

** 
* 类，构造函数
*/
class TestTask {
    constructor() {
        this.queue3 = [];
    }
    
    buildTask3(item3) {
        return () => {
            this.queue3.push(item3);
            console.log(this.queue3);
        }
    }
}

const res3 = new TestTask;
console.log(res3.buildTask3(1)());