Lodash sandbox

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.14.2/lodash.min.js"></script>

JavaScript

let arr = [{
    "x": 2.31,
    "y": 0.538
}, 
{
    "x": 7.07,
    "y": 0.469
}, 
{
    "x": 6.02,
    "y": 0.469
}, 
{
    "x": 2.18,
    "y": 0.458
}]

document.write(JSON.stringify(_.sortBy(arr, 'x')));