连接多个对象的第一个字段

Question

Is there a way in javascript to concatenate named/indexed fields (say one field of each object) of multiple objects to a string.

var theArray = [{
 field1: "TEXT",
 field2: "VAL"
 ...
},
{
 field1: "text",
 field2: "val"
 ...
}
...
];

I would like for the sake of ideomacy (ideomatic programming) to know if there's a way to concatenate values of all field1 in an array WITHOUT a for loop.

Something like

theArray.getFieldValues[0].join(', ');

Which options do we have here?

• overload Array - wouldn't do that,
• helper function - don't wanna loops.

There're filter and grep functions in jQuery, but they only filter the elements, I would like to know if there's already something like

theArray.grepNewObject(function(o){ return o.field1; }).join(', ');

Answer 1

You can use map first to get an array of just field1 and then join it:

theArray.map(function(x){return x.field1}).join(', ');

Note that map needs to be shimmed in IE 8 and earlier. Alternatively, since you're using jQuery, you can use jQuery.map for a cross-browser solution:

$.map(theArray, function(x){return x.field1}).join(', ');