使用动态条件过滤以排除javascript中的某些值

Question

I have a data array of strings:

0:"dbname_default_2018-10-26"
1:"dbname_default_2018-10-27"
2:"dbname_default_2018-10-28"
3:"dbname_default_2018-10-30"
4:"dbname_default_2018-10-31"
5:"dbname_default_2018-11-01"
6:"dbname_default_2018-11-03"
7:"dbname_default_2018-11-04"
8:"dbname_default_2018-11-06"
9:"dbname_default_2018-11-07"
10:"dbname_default_2018-11-08"

…and another array of criteria, which is dynamically created with formatDate :

0:"2018-11-06"
1:"2018-11-07"

I would like to splice items where the name includes the criteria. The goal is to delete database names depending on seniority days. So if seniority is 2, it should only keep items with date is today-2days and older.

Here's my program:

async function selectDdToDelete(dbArray, seniority) {
    let datesToKeep: string[] = [];
    let dbTokeep;
    for (let i = seniority; i >= 0; i--) {
        datesToKeep.push(
            `${formatDate(i).year}-${formatDate(i).month}-${formatDate(i).day}`
        );
    }
    dbTokeep = dbArray.filter(elm => {
        let exists = false;
        for (let i = 0; i < datesToKeep.length; i++) {
            if (elm.includes(datesToKeep[i])) {
                exists = true;
            }
        }
        if (!exists) {
            return elm;
        }
    });

    return dbTokeep;
}

I'm getting firstly an array of criteria with formatDate() which sends me an object {year:2018,month:"11",day:"06"} , for example if i==1 ( today date -i).

Then I'm filtering on the data array. Inside it, I loop the array criteria and with an intermediate variable, I decide wether I return the element or not.

Then I send the new filtered array.

My problem is that actually I get the same array in entry that at the end.

What I expect to get is:

0:"dbname_default_2018-10-26"
1:"dbname_default_2018-10-27"
2:"dbname_default_2018-10-28"
3:"dbname_default_2018-10-30"
4:"dbname_default_2018-10-31"
5:"dbname_default_2018-11-01"
6:"dbname_default_2018-11-03"
7:"dbname_default_2018-11-04"
8:"dbname_default_2018-11-08"

Answer 1

 var data = [ "dbname_default_2018-10-26", "dbname_default_2018-10-27", "dbname_default_2018-10-28", "dbname_default_2018-10-30", "dbname_default_2018-10-31", "dbname_default_2018-11-01", "dbname_default_2018-11-03", "dbname_default_2018-11-04", "dbname_default_2018-11-06", "dbname_default_2018-11-07", "dbname_default_2018-11-08" ] const dynamicCretarias = [ "2018-11-06", "2018-11-07" ]; data = data.filter((item)=> !dynamicCretarias.some(t => item.includes(t))) console.log(data) 

Answer 2

you could try to make a set of cretaria elements and then filter your data array

const data = [
"dbname_default_2018-10-26",
"dbname_default_2018-10-27",
"dbname_default_2018-10-28",
"dbname_default_2018-10-30",
"dbname_default_2018-10-31",
"dbname_default_2018-11-01",
"dbname_default_2018-11-03",
"dbname_default_2018-11-04",
"dbname_default_2018-11-06",
"dbname_default_2018-11-07",
"dbname_default_2018-11-08"
];

const dynamicCretarias = [
  "2018-11-06",
  "2018-11-07"
];

const dynamicCretariasSet = dynamicCretarias.reduce((set, item) => {
  return set.add(data.find(dataEl => dataEl.includes(item)))
}, new Set());

const filtered = data.filter(item => !dynamicCretariasSet.has(item));

Answer 3

If I understand correctly, you want to exclude items from an array of strings based on if the element contains one of the strings from some criteria array.

I would suggest using the following functions: filter() and findIndex()

findIndex can be used to determine if any of the criteria match a given element from your data array.

filter allows you to test each element of the data array and only keeps the ones you want.

 let data = [ "dbname_default_2018-10-26", "dbname_default_2018-10-27", "dbname_default_2018-10-28", "dbname_default_2018-10-30", "dbname_default_2018-10-31", "dbname_default_2018-11-01", "dbname_default_2018-11-03", "dbname_default_2018-11-04", "dbname_default_2018-11-06", "dbname_default_2018-11-07", "dbname_default_2018-11-08" ] let criteria = ["2018-10-26","2018-10-27"] let results = data.filter( element => criteria.findIndex( crit => element.includes(crit))<0) console.log(results)