How to calculate the min/max values from an array of object-Javascript

Question

I have a data showing the various data points on the chart.

var data = [{name:"s", y:2},{name:"e",y:90},{name:"tt",y:9},{name:"se",y:10}]

now i know with simple array you can use the Math.max....and Math.min to calculate the min/max values, not sure how can i achieve the same with an array of objects?

Thanks!

Sushanth -- · Accepted Answer · 2017-05-30 23:42:23Z

1

You could use .map to get right min and max values.

var data = [{name:"s", y:2},{name:"e",y:90},{name:"tt",y:9},{name:"se",y:10}];


var values = data.map(function( obj ) {
    return obj.y;
}); 

var min = Math.min.apply(null, values);
var max = Math.max.apply(null, values);

If you are using ES6, then you can get rid of .apply and replace it with spread operator.

var min = Math.min(...values);
var max = Math.max(...values);

edited May 30, 2017 at 23:42

answered May 30, 2017 at 23:39

Sushanth --

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2 Comments

fubar Over a year ago

You can't pass an array to Math.max. You need to use apply.

Sushanth -- Over a year ago

@fubar Fixed it.

fubar · Accepted Answer · 2017-05-30 23:38:41Z

0

You can still use Math.max and Math.min. Just map the data first.

const max = Math.max.apply(null, data.map((point) => point.y));
const min = Math.min.apply(null, data.map((point) => point.y));

answered May 30, 2017 at 23:38

fubar

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