如何修剪 javascript 数组

Question

I want to trim an array after splitting my springs

 data = ',VALDESC::Value Date/PDESC::Description/REFNO::Txn Ref/REF.FT::Narration/POST::Booking Date/DR.AMT::Debit/CR.AMOUNT::Credit/BALANCE::Closing Balance,"","14 MAY 19 " "Cash Withdrawal " "TT19134V74S7 " " " "14 MAY 19" "4000" "" "-4000","","21 MAY 19 " "Bulk Payment (NAMBU" "FT19141911080" " " "21 MAY 19" "" "71630.33" "90477.42","BEIGN STAFF AMY 2019 SAL","21 MAY 19 " "Bulk Payment (NAMBU" "FT19141912082" " " "21 MAY 19" "2000" "" "88477.42","STAFF COOP MAY 2019","22 MAY 19 " "Cash Withdrawal " "TT1914247YZ5 " " " "22 MAY 19" "5000" "" "83477.42","","24 MAY 19 " "POS Purchase " "FT19144536496" " " "24 MAY 19" "3400" "" "80077.42","@ MEGA CHICKEN RESTAUR LA LANG STAN","" "" "" "" "" "" "" "" "053588 ","24 MAY 19 " "POS Purchase " "FT19144019378" " " "24 MAY 19" "1400" "" "78677.42","@ MEGA CHICKEN RESTAUR LA LANG STAN","" "" "" "" "" "" "" "" "160419 ","27 MAY 19 " "ATM Cash Withdrawal" "FT19147487249" " " "27 MAY 19" "2000" "" "76677.42","@ 1 IKOYI ROAD OBALENDE LAGOS LANG ","" "" "" "" "" "" "" "" "STAN 008029 ","","","","","",""," 76677.42" "" ""' const lines = data.split('","'); for (let i = 1; i < lines.length; i++) { var g = lines[i].trim(); } console.log(g); const headerline = lines[0]; const splitHeaderline = headerline.split('/');

Answer 1

I think you want to "remove" blank element on the array and not trim them.

 data = ',VALDESC::Value Date/PDESC::Description/REFNO::Txn Ref/REF.FT::Narration/POST::Booking Date/DR.AMT::Debit/CR.AMOUNT::Credit/BALANCE::Closing Balance,"","14 MAY 19 " "Cash Withdrawal " "TT19134V74S7 " " " "14 MAY 19" "4000" "" "-4000","","21 MAY 19 " "Bulk Payment (NAMBU" "FT19141911080" " " "21 MAY 19" "" "71630.33" "90477.42","BEIGN STAFF AMY 2019 SAL","21 MAY 19 " "Bulk Payment (NAMBU" "FT19141912082" " " "21 MAY 19" "2000" "" "88477.42","STAFF COOP MAY 2019","22 MAY 19 " "Cash Withdrawal " "TT1914247YZ5 " " " "22 MAY 19" "5000" "" "83477.42","","24 MAY 19 " "POS Purchase " "FT19144536496" " " "24 MAY 19" "3400" "" "80077.42","@ MEGA CHICKEN RESTAUR LA LANG STAN","" "" "" "" "" "" "" "" "053588 ","24 MAY 19 " "POS Purchase " "FT19144019378" " " "24 MAY 19" "1400" "" "78677.42","@ MEGA CHICKEN RESTAUR LA LANG STAN","" "" "" "" "" "" "" "" "160419 ","27 MAY 19 " "ATM Cash Withdrawal" "FT19147487249" " " "27 MAY 19" "2000" "" "76677.42","@ 1 IKOYI ROAD OBALENDE LAGOS LANG ","" "" "" "" "" "" "" "" "STAN 008029 ","","","","","",""," 76677.42" "" ""' const lines = data.split('","') .filter(el => !!el) // Remove blank elements .map(el => el.trim()) // Remove white space before and after console.log(lines)

Answer 2

Although I wrote some code to parse that format according to my best guess about the structure, it's not pretty, and that is mostly due to the craziness of that format. If you have any control over it, I would suggest that you export something more reasonable. But I made a number of assumptions and ended up with this code:

 const process = (data) => { const headerEnd = ',"",' const end = data .indexOf (headerEnd) const rawHeader = data .slice (1, end) const headers = rawHeader .split ('/') .map (s => s.split('::')) .map (([name, desc]) => ({name, desc})) .concat ({name: '', desc: 'Unknown'}) const len = headers .length; const fields = data.slice(end + headerEnd.length) .split(/\\t|,/).map(s => s.slice(1, -1).trim()) const body = Array (Math .ceil (fields .length / len)) .fill () .map ((_, i) => fields. slice (i * len, i * len + len)) .map ( fields => headers .reduce ( (a, {name, desc}, i) => ({...a, [desc]: fields[i]}), {} ) ) return {headers, body} } const data = ',VALDESC::Value Date/PDESC::Description/REFNO::Txn Ref/REF.FT::Narration/POST::Booking Date/DR.AMT::Debit/CR.AMOUNT::Credit/BALANCE::Closing Balance,"","14 MAY 19 " "Cash Withdrawal " "TT19134V74S7 " " " "14 MAY 19" "4000" "" "-4000","","21 MAY 19 " "Bulk Payment (NAMBU" "FT19141911080" " " "21 MAY 19" "" "71630.33" "90477.42","BEIGN STAFF AMY 2019 SAL","21 MAY 19 " "Bulk Payment (NAMBU" "FT19141912082" " " "21 MAY 19" "2000" "" "88477.42","STAFF COOP MAY 2019","22 MAY 19 " "Cash Withdrawal " "TT1914247YZ5 " " " "22 MAY 19" "5000" "" "83477.42","","24 MAY 19 " "POS Purchase " "FT19144536496" " " "24 MAY 19" "3400" "" "80077.42","@ MEGA CHICKEN RESTAUR LA LANG STAN","" "" "" "" "" "" "" "" "053588 ","24 MAY 19 " "POS Purchase " "FT19144019378" " " "24 MAY 19" "1400" "" "78677.42","@ MEGA CHICKEN RESTAUR LA LANG STAN","" "" "" "" "" "" "" "" "160419 ","27 MAY 19 " "ATM Cash Withdrawal" "FT19147487249" " " "27 MAY 19" "2000" "" "76677.42","@ 1 IKOYI ROAD OBALENDE LAGOS LANG ","" "" "" "" "" "" "" "" "STAN 008029 ","","","","","",""," 76677.42" "" ""' console .log ( process (data) )

It generates output like this:

{
  headers: [
    {
      name: 'VALDESC',
      desc: 'Value Date'
    },
    {
      name: 'PDESC',
      desc: 'Description'
    },
  // ...
  ],
  body: [
    {
      'Value Date': '14 MAY 19',
      Description: 'Cash Withdrawal',
      'Txn Ref': 'TT19134V74S7',
      Narration: '',
      'Booking Date': '14 MAY 19',
      Debit: '4000',
      Credit: '',
      'Closing Balance': '-4000",
      Unknown: ''
    },
    {
      'Value Date': '21 MAY 19',
      Description: 'Bulk Payment (NAMBU',
      'Txn Ref': 'FT19141911080',
      Narration: '',
      'Booking Date': '21 MAY 19',
      Debit: '',
      Credit: '71630.33',
      'Closing Balance': '90477.42',
      'Unknown': 'BEIGN STAFF AMY 2019 SAL'
    },
    // ...
  ]
}

You could change the keys here from the longer descriptive phrase to the shorthand, simply by replacing

        (a, {name, desc}, i) => ({...a, [desc]: fields[i]}),

with

        (a, {name, desc}, i) => ({...a, [name]: fields[i]}),

And obviously if you have no need of the headers, you can return simply body .

But again, I would not use code like this if I had any hope of altering the input format.