ways to extract data from nested arrays

Question

ways to extract data from nested arrays

    console.log(csvcontents.data.length - 8);
        for (let i = 7; i < csvcontents.data.length - 1; i++) {
          // console.log(csvcontents.data[i][0]);
          // arrayListFromCsvFile.push(csvcontents.data[i]);
           arrayListFromCsvFile.push(csvcontents.data[i]);
        }
        console.log(arrayListFromCsvFile); 
      }

The following code snippet displays the specified output:

[
  [
    '2021-05-18',
    '17:07:32',
    'Informational',
    'abc',
    'xyz',
    "Web user 'abc' logged in ",
    '0x00'
  ],
[
    '2021-05-18',
    '17:07:32',
    'Informational',
    'xyz',
    'abc',
    "Web user 'abc' logged in ",
    '0x10'
  ],
]

Is there a way to exclude values with indexes starting from 2,3,6?
In other words, only include '2021-05-18', '17:07:32', 'abc', and 'Web user 'abc' logged in' in both arrays.

javascript angularjs multidimensional-array protractor slice

Answer 1

Answer №1

Check out the array.splice() method for processing arrays in JavaScript.

const data = 
 [ [ '2021-05-18'
    , '17:07:32'
    , 'Informational'
    , 'abc'
    , 'xyz'
    , "Web user 'abc' logged in "
    , '0x00'
    ] 
  , [ '2021-05-18'
    , '17:07:32'
    , 'Informational'
    , 'xyz'
    , 'abc'
    , "Web user 'abc' logged in "
    , '0x10'
  ] ] 
      
      
data.forEach(row=>
  {
  row.splice(6,1) // beginning from the end,
  row.splice(3,1)
  row.splice(2,1)
  })
  
console.log( data )

.as-console-wrapper {max-height: 100%!important;top:0}

Answer 2

Check out the array.splice() method for processing arrays in JavaScript.

const data = 
 [ [ '2021-05-18'
    , '17:07:32'
    , 'Informational'
    , 'abc'
    , 'xyz'
    , "Web user 'abc' logged in "
    , '0x00'
    ] 
  , [ '2021-05-18'
    , '17:07:32'
    , 'Informational'
    , 'xyz'
    , 'abc'
    , "Web user 'abc' logged in "
    , '0x10'
  ] ] 
      
      
data.forEach(row=>
  {
  row.splice(6,1) // beginning from the end,
  row.splice(3,1)
  row.splice(2,1)
  })
  
console.log( data )

.as-console-wrapper {max-height: 100%!important;top:0}

Answer 3

Answer №2

Give this a shot.


    console.log(csvcontents.data.length - 8);

    //loop through each item and create a new array with specific elements.

    const newArrayFromCsv = csvcontents.data.map((item) => {
       return [item[0], item[2], item[4], item[6]]
    })
    console.log(newArrayFromCsv);

Answer 4

Give this a shot.


    console.log(csvcontents.data.length - 8);

    //loop through each item and create a new array with specific elements.

    const newArrayFromCsv = csvcontents.data.map((item) => {
       return [item[0], item[2], item[4], item[6]]
    })
    console.log(newArrayFromCsv);

Answer 5

Answer №3

To break down an array, extract the data at specific indexes and add it to a new array.

function process() {
  console.log(dataArray.length - 8);
  for (let i = 7; i < dataArray.length - 1; i++) {
    const [a, b, c, d, e, f, g] = dataArray[i];
    newArray.push([a, b, d, f]);
  }
  console.log(newArray);
}

Example:

const arr = [0, 1, 2, 3, 4, 5, 6];
const result = [];
const [a, b, c, d, e, f, g] = arr;
result.push([a, b, d, f]);
console.log(result);

Answer 6

To break down an array, extract the data at specific indexes and add it to a new array.

function process() {
  console.log(dataArray.length - 8);
  for (let i = 7; i < dataArray.length - 1; i++) {
    const [a, b, c, d, e, f, g] = dataArray[i];
    newArray.push([a, b, d, f]);
  }
  console.log(newArray);
}

Example:

const arr = [0, 1, 2, 3, 4, 5, 6];
const result = [];
const [a, b, c, d, e, f, g] = arr;
result.push([a, b, d, f]);
console.log(result);

Answer 7

Answer №4

function alterDataArray (arr){
      return arr.map( element =>  {
         return element.filter( (el, index) => {
           return ![2,3,6].includes(index) ;
         })
      })
    }
    const information = [
          [
            '2021-05-18',
            '17:07:32',
            'Informational',
            'abc',
            'xyz',
            "Web user 'abc' logged in ",
            '0x00'
          ],
          [
            '2021-05-18',
            '17:07:32',
            'Informational',
            'xyz',
            'abc',
            "Web user 'abc' logged in ",
            '0x10'
          ],
    ]
console.log(alterDataArray(information))

Answer 8

function alterDataArray (arr){
      return arr.map( element =>  {
         return element.filter( (el, index) => {
           return ![2,3,6].includes(index) ;
         })
      })
    }
    const information = [
          [
            '2021-05-18',
            '17:07:32',
            'Informational',
            'abc',
            'xyz',
            "Web user 'abc' logged in ",
            '0x00'
          ],
          [
            '2021-05-18',
            '17:07:32',
            'Informational',
            'xyz',
            'abc',
            "Web user 'abc' logged in ",
            '0x10'
          ],
    ]
console.log(alterDataArray(information))

Answer 9

Answer №5

console.log(csvcontents.data.length - 8);// Starting data at the 8th row, so counting length from there
    for (let i = 7; i < csvcontents.data.length - 1; i++) {
      // console.log(csvcontents.data[i][0]);
      // arrayListFromCsvFile.push(csvcontents.data[i]);

      csvcontents.data[i].splice(2, 1);  // Removing index 2 and shifting elements // 0 1 2 3 4 5    //2 3 5
      csvcontents.data[i].splice(2, 1);
      csvcontents.data[i].splice(4, 1);
      arrayListFromCsvFile.push(csvcontents.data[i]);
    }
    console.log(arrayListFromCsvFile);

Successful implementation after using splice() method.

Answer 10

console.log(csvcontents.data.length - 8);// Starting data at the 8th row, so counting length from there
    for (let i = 7; i < csvcontents.data.length - 1; i++) {
      // console.log(csvcontents.data[i][0]);
      // arrayListFromCsvFile.push(csvcontents.data[i]);

      csvcontents.data[i].splice(2, 1);  // Removing index 2 and shifting elements // 0 1 2 3 4 5    //2 3 5
      csvcontents.data[i].splice(2, 1);
      csvcontents.data[i].splice(4, 1);
      arrayListFromCsvFile.push(csvcontents.data[i]);
    }
    console.log(arrayListFromCsvFile);

Successful implementation after using splice() method.

ways to extract data from nested arrays

Answer №1

Answer №2

Answer №3

Answer №4

Answer №5

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