JSON Stringify Format Array

Question

Let say I have JSON object below:

var name = [
{
    "first": "juan",
    "last": "delaCruz"
},
{
    "first": "james",
    "last": "bond"
}

]

Can we use JSON.stringify to have the output:

juan, james

Answer 1

You might be looking for pluck, like in underscore. A basic implementation looks like this:

function pluck(collection, key) {
    return collection.map(function(el) {
        return el[key];
    });
}


var name = [{
    first: 'juan',
    last:'dela Cruz'
}, {
    first: 'james',
    last:'bond'
    }
];

var fullname = pluck(name, 'first');

Answer 2

Since the expected output doesn't appear to be valid JSON, you won't be able to get it with just JSON.stringify().

But, you could combine .map() and .join() to accomplish it:

var firsts = name.map(function (entry) {
    return entry.first;
});

console.log(firsts.join(', ')); // juan, james

.map() is new with ECMAScript 5, so it'll be readily available in IE 9+ and other modern browsers. And, MDN includes a good polyfill to add it in older browsers.