# How do you find Min & Max of a property in an array of objects in Javascript

I have the following javascript object:

Person1.Name = "John";
Person1.Age = 12;

Person2.Name = "Joe";
Person2.Age = 5;

I then have an array of persons, how do I find the Min/Max based on a persons age?

Any solution in Javascript or Jquery is acceptable.

Say your array looks like this:

var persons = [{Name:"John",Age:12},{Name:"Joe",Age:5}];

then you can:

var min = Math.min.apply(null, persons.map(function(a){return a.Age;}))
,max = Math.max.apply(null, persons.map(function(a){return a.Age;}))

const minmax = (someArrayOfObjects, someKey) => {
const values = someArrayOfObjects.map( value => value[someKey] );
return {
min: Math.min.apply(null, values),
max: Math.max.apply(null, values)
};
};

console.log(
minmax(
[ {Name: "John", Age: 12},
{Name: "Joe", Age: 5},
{Name: "Mary", Age: 3},
{Name: "James sr", Age: 93},
{Name: "Anne", Age: 33} ],
'Age')
);

First you sort the array with a custom sorting function:

var sorted = persons.sort(function(a, b) {
if(a.Age > b.Age) return 1;
else if(a.Age < b.Age) return -1;
else return 0;
});

Then you can just take the first and last:

var min = sorted[0],
max = sorted[sorted.length - 1];