获取嵌套 JSON 对象的最小值和最大值

Question

I have a nested json object which looks like---

      [
      {"key":"AXCG","values":[
        {"interval":'1_to_2years',"value":34},
        {"interval":'3_to_4years',"value":12},
        {"interval":'5_to_6years',"value":45},
      ]},
      {"key":"BDGT","values":[
        {"interval":'1_to_2years',"value":194},
        {"interval":'3_to_4years',"value":12},
        {"interval":'5_to_6years',"value":45},
      ]},
{"key":"YTEF","values":[
        {"interval":'1_to_2years',"value":0},
        {"interval":'3_to_4years',"value":12},
        {"interval":'5_to_6years',"value":15},
      ]}]

I want to find the min and max among the value. Like in this case it would be min 0 and 194 maximum. How should I do it?

Answer 1

Find below the code for your use-case,

'use strict'
const collection = [
    {
        "key": "AXCG", "values": [
            { "interval": '1_to_2years', "value": 34 },
            { "interval": '3_to_4years', "value": 12 },
            { "interval": '5_to_6years', "value": 45 },
        ]
    },
    {
        "key": "BDGT", "values": [
            { "interval": '1_to_2years', "value": 194 },
            { "interval": '3_to_4years', "value": 12 },
            { "interval": '5_to_6years', "value": 45 },
        ]
    },
    {
        "key": "YTEF", "values": [
            { "interval": '1_to_2years', "value": 0 },
            { "interval": '3_to_4years', "value": 12 },
            { "interval": '5_to_6years', "value": 15 },
        ]
    }]
const list = []
collection.every(e => e.values.every(e2 => list.push(e2.value)));

console.log('Max Value:: ' + Math.max.apply(null, list)); // 194
console.log('Min Value:: ' + Math.min.apply(null, list)); // 0

Answer 2

var collection = [
    {
        "key": "AXCG", "values": [
            { "interval": '1_to_2years', "value": 34 },
            { "interval": '3_to_4years', "value": 12 },
            { "interval": '5_to_6years', "value": 45 },
        ]
    },
    {
        "key": "BDGT", "values": [
            { "interval": '1_to_2years', "value": 194 },
            { "interval": '3_to_4years', "value": 12 },
            { "interval": '5_to_6years', "value": 45 },
        ]
    },
    {
        "key": "YTEF", "values": [
            { "interval": '1_to_2years', "value": 0 },
            { "interval": '3_to_4years', "value": 12 },
            { "interval": '5_to_6years', "value": 15 },
        ]
    }
];


var values = [];

collection.forEach(function (item) {
    item.values.forEach(function (nestedItem) {
        values.push(nestedItem.value);
    });
});

console.log("Min:" + Math.min.apply(Math, values)); // Min:0
console.log("Max:" + Math.max.apply(Math, values)); // Max:194

Answer 3

Another variation on the simple idea of using Array.forEach:

    var o = [
        {
            "key": "AXCG", "values": [
                { "interval": '1_to_2years', "value": 34 },
                { "interval": '3_to_4years', "value": 12 },
                { "interval": '5_to_6years', "value": 45 },
            ]
        },
        {
            "key": "BDGT", "values": [
                { "interval": '1_to_2years', "value": 194 },
                { "interval": '3_to_4years', "value": 12 },
                { "interval": '5_to_6years', "value": 45 },
            ]
        },
        {
            "key": "YTEF", "values": [
                { "interval": '1_to_2years', "value": 0 },
                { "interval": '3_to_4years', "value": 12 },
                { "interval": '5_to_6years', "value": 15 },
            ]
        }];
    var minimum = 9999;
    var maximum = 0;


    o.forEach(function (element) {
        var inner = element.values;
        inner.forEach(function (innerELement) {
            if (innerELement.value < minimum) minimum = innerELement.value;
            if (innerELement.value > maximum) maximum = innerELement.value;
        });
    });


    console.log('Min is ' + minimum + ' and max is ' + maximum);

Answer 4

You can use array#reduce to get the minimum and maximum value of the value inside the values array. Iterate through each object of values array and compare the values with minimum and maximum value stored and when you encounter new minimum and maximum value update the stored value.

 var collection = [{ "key": "AXCG", "values": [{ "interval": '1_to_2years', "value": 34 }, { "interval": '3_to_4years', "value": 12 }, { "interval": '5_to_6years', "value": 45 }, ] }, { "key": "BDGT", "values": [{ "interval": '1_to_2years', "value": 194 }, { "interval": '3_to_4years', "value": 12 }, { "interval": '5_to_6years', "value": 45 }, ] }, { "key": "YTEF", "values": [{ "interval": '1_to_2years', "value": 0 }, { "interval": '3_to_4years', "value": 12 }, { "interval": '5_to_6years', "value": 15}, ] } ], result = collection.reduce((r,{values}) => { values.forEach(({value}) => { r.min = r.min > value ? value : r.min; r.max = r.max < value ? value : r.max; }); return r; },{min: Number.MAX_SAFE_INTEGER, max: Number.MIN_SAFE_INTEGER}); console.log(result);