Find the object whose property "Y" has the greatest value in an array of objects

One way would be to use Array reduce..

const max = data.reduce(function(prev, current) {
  return (prev && prev.y > current.y) ? prev : current
}) //returns object

• https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/Reduce
• http://caniuse.com/#search=reduce (IE9 and above)

If you don't need to support IE (only Edge), or can use a pre-compiler such as Babel you could use the more terse syntax.

const max = data.reduce((prev, current) => (prev && prev.y > current.y) ? prev : current)

Note that if you have multiple objects sharing the same max value, it will only return the first matched object.