替换数组中特定字段的逗号？

Question

I am trying to replace commas in a specific field in an array. For example I have below the following array which represents data collected from a csv file:

[
    {
      "Month/Year": "2019-09",
      "group": "blue",
      "flights": "668,620"
    },
    {
        "Month/Year": "2019-10",
        "group": "blue",
        "flights": "662,520"
    },
    {
        "Month/Year": "2019-09",
        "group": "green",
        "flights": "662,520"
    },
    {
        "Month/Year": "2019-10",
        "group": "green",
        "flights": "678,520"
    }
]

Desired

[
    {
      "Month/Year": "2019-09",
      "group": "blue",
      "flights": "668620"
    },
    {
        "Month/Year": "2019-10",
        "group": "blue",
        "flights": "662520"
    },
    {
        "Month/Year": "2019-09",
        "group": "green",
        "flights": "662520"
    },
    {
        "Month/Year": "2019-10",
        "group": "green",
        "flights": "678520"
    }
]

How can I run a cleaning operation on this JSON before I work with it? I am thinking when the JSON is brought in I treat it by cleaning it and then I can work with it for graphing purposes.

Answer 1

You can use array function map:

 const data = [ { "Month/Year": "2019-09", "group": "blue", "flights": "668,620" }, { "Month/Year": "2019-10", "group": "blue", "flights": "662,520" }, { "Month/Year": "2019-09", "group": "green", "flights": "662,520" }, { "Month/Year": "2019-10", "group": "green", "flights": "678,520" } ] const result = data.map(item => {item.flights = item.flights.replace(",",""); return item}) console.log(result)

Answer 2

You can go with simple map and replace methods.

 let newArray = array.map(obj => { obj.flights = obj.flights.replace(/,/g, ''); return obj; })

Answer 3

Assuming you call this array arr , you can access each of the desired fields by using elem.flights (for each element of the array), and remove its comma by using replace(",", "") :

 arr = [ { "Month/Year": "2019-09", "group": "blue", "flights": "668,620" }, { "Month/Year": "2019-10", "group": "blue", "flights": "662,520" }, { "Month/Year": "2019-09", "group": "green", "flights": "662,520" }, { "Month/Year": "2019-10", "group": "green", "flights": "678,520" } ]; for(var elem of arr) { elem.flights = elem.flights.replace(",", ""); console.log(elem.flights); }

Answer 4

There are a few different ways to loop over an array in javascript. I like good old fashioned for loops.

var obj = [
{
  "Month/Year": "2019-09",
  "group": "blue",
  "flights": "668,620"
},
{
    "Month/Year": "2019-10",
    "group": "blue",
    "flights": "662,520"
},
{
    "Month/Year": "2019-09",
    "group": "green",
    "flights": "662,520"
},
{
    "Month/Year": "2019-10",
    "group": "green",
    "flights": "678,520"
}];

for(var i = 0; i < obj.length; i++)
{
    obj[i]['flights'] = obj[i]['flights'].split(',').join('');
}

Using .split(',') converts the string to an array and then .join('') converts it back to a string but w/oa separator.