Question

How use nested object as property in other object with JavaScript

Answer 1

const user = {
    language: {
    name: 'PHP'
  },
  id: 83829,
  name: 'Tom'
};


document.write(user.id + '<br />');
document.write(user.name + '<br />');
document.write(user.language.name + '<br />');
document.write(user['language']['name'] + '<br />');
document.write(user.language['name'] + '<br />');
document.write(user['language'].name + '<br />');


/*
run:
          
83829
Tom
PHP
PHP
PHP
PHP
        
*/

 

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Answer 2

const user = {
    language: {
    name: 'PHP'
  },
  id: 83829,
  name: 'Tom'
};


document.write(user.id + '<br />');

user.name = "Arthur";
document.write(user.name + '<br />');

user.language.name = 'JavaScript';
document.write(user.language.name + '<br />');
document.write(user['language']['name'] + '<br />');
document.write(user.language['name'] + '<br />');
document.write(user['language'].name + '<br />');


/*
run:
          
83829
Arthur
JavaScript
JavaScript
JavaScript
JavaScript
        
*/

 

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Answer 3

const user = {
    language: {
    name: 'PHP'
  },
  id: 83829,
  name: 'Tom'
};


document.write(user.id + '<br />');

user.name = "Arthur";
document.write(user.name + '<br />');

delete user.language.name;
document.write(user.language.name + '<br />');
document.write(user['language']['name'] + '<br />');
document.write(user.language['name'] + '<br />');
document.write(user['language'].name + '<br />');


/*
run:
          
83829
Arthur
undefined
undefined
undefined
undefined
        
*/

 

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Answer 4

const user = {
    language: {
    name: 'PHP'
  },
  id: 83829,
  name: undefined
};


document.write(user.id + '<br />');

document.write(user.name + '<br />');
user.name = "Arthur";
document.write(user.name + '<br />');


document.write(user.language.name + '<br />');
document.write(user['language']['name'] + '<br />');
document.write(user.language['name'] + '<br />');
document.write(user['language'].name + '<br />');



/*
run:
          
83829
undefined
Arthur
PHP
PHP
PHP
PHP
        
*/

 

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