JavaScript/Underscore get Min Max values for All Items in Object

Question

I'm having trouble figuring out how to get min/max value out of this object:

 "Prices" : {                                                                                                                                                                                                                                  
                "2014,1,11,0,0,0" : 1089,                                                                                                                                                                                                            
                "2014,1,12,0,0,0" : 1081,                                                                                                                                                                                                            
                "2014,1,13,0,0,0" : 1077,                                                                                                                                                                                                            
                "2014,1,14,0,0,0" : 1069,                                                                                                                                                                                                            
                "2014,1,17,0,0,0" : 1078,                                                                                                                                                                                                            
                "2014,1,18,0,0,0" : 1089,                                                                                                                                                                                                            
                "2014,1,19,0,0,0" : 1095
            }

I want to get the min/max of the numbers (Not dates) I was looking into _.pluck but it requires the key name but I don't know it. It's dates.... Any way to by pass that?

Etheryte · Accepted Answer · 2015-02-09 01:21:03Z

2

You can either use a for..in loop or Object.keys() in vanilla Javascript, I'm sure Underscore has wrappers of some sort for those, too.

var p = {
  '2014,1,11,0,0,0': 1089,
  '2014,1,12,0,0,0': 1081,
  '2014,1,13,0,0,0': 1077,
  '2014,1,14,0,0,0': 1069,
  '2014,1,17,0,0,0': 1078,
  '2014,1,18,0,0,0': 1089,
  '2014,1,19,0,0,0': 1095
};
var min = Number.POSITIVE_INFINITY;
var max = Number.NEGATIVE_INFINITY;
for (var prop in p) {
  if (p.hasOwnProperty(prop)) {
    min = Math.min(min, p[prop]);
    max = Math.max(max, p[prop]);
  }
}
console.log('min: ' + min);
console.log('max: ' + max);

answered Feb 9, 2015 at 1:21

Etheryte

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Comments

Gent · Accepted Answer · 2015-02-09 01:35:49Z

1

You can use _.values(prices). With this approach you can then use _.keys(prices) and use that as a lookup for the correct key.

http://jsfiddle.net/x7eewf1d/2/

Although it may not be as efficient as other solutions, it will make clear to the next developer (who may be you) what is happening.

var prices = {
  '2014,1,11,0,0,0': 1089,
  '2014,1,12,0,0,0': 1081,
  '2014,1,13,0,0,0': 1077,
  '2014,1,14,0,0,0': 1069,
  '2014,1,17,0,0,0': 1078,
  '2014,1,18,0,0,0': 1089,
  '2014,1,19,0,0,0': 1095
};

var vals = _.values(prices);
var dates = _.keys(prices);

var min = _.min(vals);
var max = _.max(vals);

var minDate = dates[vals.indexOf(min)];
var maxDate = dates[vals.indexOf(max)];;

edited Feb 9, 2015 at 1:35

answered Feb 9, 2015 at 1:20

Gent

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Comments

RobG · Accepted Answer · 2015-02-09 01:46:05Z

0

Another plain JS option is using Object.keys to get an array of the keys, map to get an array of the values, and finally Math.max to get the maximum value:

var p = {
  '2014,1,11,0,0,0': 1089,
  '2014,1,12,0,0,0': 1081,
  '2014,1,13,0,0,0': 1077,
  '2014,1,14,0,0,0': 1069,
  '2014,1,17,0,0,0': 1078,
  '2014,1,18,0,0,0': 1089,
  '2014,1,19,0,0,0': 1095
};

Math.max.apply(Math, Object.keys(p).map(function(key) {return p[key]})); // 1095

and to get the minimum:

Math.min.apply(Math, Object.keys(p).map(function(key) {return p[key]})); // 1069

A for..in loop may be more code than the above, but it's probably a lot faster.

answered Feb 9, 2015 at 1:46

RobG

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