Question

How to iterate over the properties of an object in JavaScript

Answer 1

class Worker {
    constructor(id, name, age) {
        this.id = id;
        this.name = name;
        this.age = age;
        this.show = function () {
            console.log(this.id + ' ' + this.name);
        };
    }
}
  
const worker = new Worker(2345, 'Tom', 54);

for (let key in worker) {
    if (typeof worker[key] !== 'function')
        console.log(key, worker[key]);
}

  
  
  
/*
run:
  
id 2345
name Tom
age 54
  
*/
 

 

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Answer 2

class Worker {
    constructor(id, name, age) {
        this.id = id;
        this.name = name;
        this.age = age;
    }
    show () {
        console.log(this.id + ' ' + this.name + ' ' + this.age);
    }
}
  
const worker = new Worker(2345, 'Tom', 54);

Object.entries(worker).map(key_val => {
    console.log(key_val[0] + ' : ' + key_val[1]);
});

  
  
  
/*
run:
  
id : 2345
name : Tom
age : 54
  
*/
 

 

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Answer 3

class Worker {
    constructor(id, name, age) {
        this.id = id;
        this.name = name;
        this.age = age;
    }
    show () {
        console.log(this.id + ' ' + this.name + ' ' + this.age);
    }
}
  
const worker = new Worker(2345, 'Tom', 54);

for (let key in worker) {
    console.log(key, worker[key]);
}

  
  
  
/*
run:
  
id : 2345
name : Tom
age : 54
  
*/
 

 

70+ SQL courses for beginners and professionals