Find min/max values from object array exlcuding infinity

52
May 18, 2019, at 4:40 PM

I have an array of objects where I want to find the min/max value of a property in each object. I currently have a working method to find the min, however I am struggling with the max, if the value is Infinity I want to ignore it.

let result = [

{
"id": "Foo 1",
"result": Infinity
},
{
"id": "Foo 2",

"result": 240.77777777777777
},
{
"id": "Foo 3",

"result": 714.55
},
{
"id": "Foo 4",
"result": Infinity
},
{
"id": "Foo 5",
"result": 1314.55
},
{
"id": "foo 6",
"result": Infinity
},
]

let minCount = result.reduce(function(max, obj) {
return obj.result < max.result ? obj : max;
});
console.log("Min", minCount.result);
let maxCount = result.reduce(function(max, obj) {
return obj.result > max.result ? obj : max;
});
console.log("Max", maxCount.result);

This code works fine for unless I have an infinite value as result I've tried setting the return to return isFinite(obj.result) > max.result ? obj : max; However once it gets to the first Infinit value it will get the value before it, and stop looking for a max value in the rest of the function.

I've similarly tried return obj.result > isFinite(max.result) ? obj : max; Which does the opposite and finds the last value and not regard if its infinity.

If it makes things easier I can change the infinite value to undefined or another primitive, however I can't have these values affecting my Min/Max calculation.

It might be easier to filter by isFinite, and then spread into Math.min or Math.max:

let result = [
{
"id": "Foo 1",
"result": Infinity
},
{
"id": "Foo 2",
"result": 240.77777777777777
},
{
"id": "Foo 3",
"result": 714.55
},
{
"id": "Foo 4",
"result": Infinity
},
{
"id": "Foo 5",
"result": 1314.55
},
{
"id": "foo 6",
"result": Infinity
},
]

const numsOnly = result.map(({ result }) => result);
const min = Math.min(...numsOnly.filter(isFinite));
const max = Math.max(...numsOnly.filter(isFinite));
console.log('min', min, 'max', max);

If you need the objects as well as the max/min values, filter the objects by isFinite first:

let result = [
{
"id": "Foo 1",
"result": Infinity
},
{
"id": "Foo 2",
"result": 240.77777777777777
},
{
"id": "Foo 3",
"result": 714.55
},
{
"id": "Foo 4",
"result": Infinity
},
{
"id": "Foo 5",
"result": 1314.55
},
{
"id": "foo 6",
"result": Infinity
},
]

const finiteObjs = result.filter(({ result }) => isFinite(result));
const minObj = finiteObjs.reduce((a, b) => a.result < b.result ? a : b);
const maxObj = finiteObjs.reduce((a, b) => a.result > b.result ? a : b);
console.log('minObj', minObj, 'maxObj', maxObj);

Check with this

let result = [

{
"id": "Foo 1",
"result": Infinity
},
{
"id": "Foo 2",

"result": 240.77777777777777
},
{
"id": "Foo 3",

"result": 714.55
},
{
"id": "Foo 4",
"result": Infinity
},
{
"id": "Foo 5",
"result": 1314.55
},
{
"id": "foo 6",
"result": Infinity
},
]

let min=Number.MAX_VALUE;
let max=Number.MIN_VALUE;

result.forEach(item => {
min = isFinite(item.result) ? Math.min(item.result,min): min;

max = isFinite(item.result) ? Math.max(item.result,max): max;

});

console.log('Min:', min);
console.log('Max:',max);

It only works if your array contains at least one min and Max value ( Finite values)

You can slightly change your comparison logic and get it working. Have a look at this:

const max = result.reduce((a,b)=>{
return a > b.result && isFinite(a) ? a : (isFinite(b.result) ? b.result : a);
},0)
POPULAR ONLINE

Combining two text files in PHP [on hold] How to sort array of objects by day, if object can includes 2 or more timestamp, if no same date - create new property & set to null

I have array of objects where each element has 2 or more unique keys 'datetime' and also i have data that belongs to the each datetimeI need sort by same date(by day), if no date we should set value to null

33 loop inner object array in angular without having iteration of outer array [on hold]

I am web service which return nested object arrayIn my angular example, I have iterated the inner array ie currencies in users

36 Ionic 4: No emulator images (avds) found

I'm trying to emulate my ionic 4 app into Android Emulator so I run the command:

51 Do you know any frontend formula creator component to use in html app? [on hold]

We are building financial single page application using angularWe need to build a UI for user to create formula like how we do in excel

44