Correct syntax when printing a object property when using array in JavaScript?

Question

What is the correct syntax when extracting an object property from an array?

example

var bob = {
    firstName: "Bob",
    lastName: "Jones",
    phoneNumber: "(650) 777-7777",
    email: "bob.jones@example.com"
};

var mary = {
    firstName: "Mary",
    lastName: "Johnson",
    phoneNumber: "(650) 888 - 8888",
    email: "mary.johnson@example.com"
}

var contact = [bob, mary];

console.log(contact[1.phoneNumber]); // <-- Need help here to print phoneNumber!

So when I want to print out the phoneNumber property from mary object using the contact array what is the correct syntax?

`contact[0].phoneNumber`, `contact[1].phoneNumber`? Have you researched this? Searched on Google and similar? — PhistucK, May 06 '14 at 12:13
`console.log( contact[0].phoneNumber ); // will print bob's phone #` — enhzflep, May 06 '14 at 12:13

laaposto · Accepted Answer · 2014-05-06T12:24:35.567

1

console.log(contact[1.phoneNumber]); will lead to an Unexpected token ILLEGAL cause there is not such number.

Try this instead:

console.log(contact[1].phoneNumber);

DEMO

edited May 06 '14 at 12:24

answered May 06 '14 at 12:13

laaposto

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@S4M1R maybe you want to get BOB's number? – laaposto May 06 '14 at 12:18
laaposto is right, you need `contact[0]` not `contact[1]` – SparK May 06 '14 at 12:20
*"cause there is not such index in array."* no, that wouldn't lead to a syntax error. Accessing a non-existing property simply returns `undefined`. The reason for the error is that `1.x` is invalid if x is not a digit. – Felix Kling May 06 '14 at 12:23
you mean it's the same as array[undefined]? – SparK May 06 '14 at 17:01

Correct syntax when printing a object property when using array in JavaScript?

1 Answers1