Edit in JSFiddle

var strings = ['something', 'Bob', 'word', 'London', 'ingest', 'Stuff'];

var capStrings = [];

for (var i = 0, len = strings.length; i < len; i++) {
    if (strings[i].match(/^[A-Z]/)) {
        capStrings.push(strings[i]);
    }
}

console.log(capStrings);