javascript比较两个对象并打印值

Question

Compare Two javascript object and array and console respective values.can anyone help me please

 const Icons = { mail: 'fa fa-envelope', phone: 'fa fa-phone', user: 'fa fa-user', cart: 'fa fa-cart' }; const icon = [ 'mail', 'phone', 'user', 'cart' ]; icon.map(function(v, i) { console.log(i, Icons.v); });

expected output:

0,fa fa-envelope
1,fa fa-phone
2,fa fa-user
3,fa fa-cart

getting undefined can anyone please tell me whats wrong

Answer 1

You are getting undefined as Icons doesn't have a property v .

Since v is a variable use Bracket notation . ie Icons[v]

 const Icons = { mail: 'fa fa-envelope', phone: 'fa fa-phone', user: 'fa fa-user', cart: 'fa fa-cart' }; const icon = [ 'mail', 'phone', 'user', 'cart' ]; icon.map(function(v, i) { console.log(i, Icons[v]); });

Answer 2

const Icons = {
 mail:'fa fa-envelope',
 phone:'fa fa-phone',
 user:'fa fa-user',
 cart:'fa fa-cart'
};

const icon = [
    'mail',
    'phone',
    'user',
    'cart'
];

icon.map(function(v,i){
  console.log(i,Icons[v]);  //try this
});