如何从数组 ele.nets 中删除空字符串

Question

Here I am Taking a string data and converting it into array elements but it is getting an empty array at last of all array elements and I am not be able to remove them easily.Please help.

 let string_Data = `01226,Grover Cleveland,Anna,Uganda,Crucial Ltd,Tested Mutual BV,Calvin Coolidge, 77110,John F. Kennedy,hora,Bosnia Herzegovina,Formal,Papal Corporation,Franklin Roosevelt, 29552,Lyndon B. Johnson,Margaret,Palau,Summaries Holdings Inc,Customize,Rutherford B. Hayes,`; let making_Array = csv => { var data = []; for (let dataAry of csv.split('\n')) { data.push(dataAry.split(',')); } return data; } console.log(making_Array(string_Data));

Answer 1

Instead of manipulating arrays, you can prepare the string before being split.

 let string_Data = `01226,Grover Cleveland,Anna,Uganda,Crucial Ltd,Tested Mutual BV,Calvin Coolidge, 77110,John F. Kennedy,hora,Bosnia Herzegovina,Formal,Papal Corporation,Franklin Roosevelt, 29552,Lyndon B. Johnson,Margaret,Palau,Summaries Holdings Inc,Customize,Rutherford B. Hayes,`; let making_Array = csv => { var data = []; for (let dataAry of csv.split('\n')) { // 1. trim both ends of the line for white space, tab, etc. // 2. remove any last trailing comma // 3. split using comma separator data.push(dataAry.trim().replace(/,$/, '').split(',')); } return data; } console.log(making_Array(string_Data));

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FWIW the entire function can be streamlined, and enhanced like this:

 let header = ['id', 'col1', 'col2', 'col3', 'col4', 'col5', 'col6']; let string_Data = `01226,Grover Cleveland,Anna,Uganda,Crucial Ltd,Tested Mutual BV,Calvin Coolidge, 77110,John F. Kennedy,hora,Bosnia Herzegovina,Formal,Papal Corporation,Franklin Roosevelt, 29552,Lyndon B. Johnson,Margaret,Palau,Summaries Holdings Inc,Customize,Rutherford B. Hayes,`; let making_Array = csv => csv.split('\n').map(line => line.trim() // 1. trim both ends of the line.replace(/,$/, '') // 2. remove any last trailing comma.split(',')) // 3. split using comma separator.map(cols => Object.fromEntries(new Map(header.map((colName, index) => [colName, cols[index] || ''])))); console.log(making_Array(string_Data));

Answer 2

The empty string is because of the , at the end of each line.

You can use the slice() method to remove the last element of the array.

data.push(dataAry.split(',').slice(0, -1))

When you use a negative index as the end of a slice, it counts from the end.

Answer 3

This will remove empty strings, but it'll also remove falsey values.

const values = arr.filter(Boolean);