JavaScript: Converts a comma-separated values string to a 2D array
JavaScript fundamental (ES6 Syntax): Exercise-3 with Solution
Write a JavaScript program to converts a comma-separated values (CSV) string to a 2D array.
Note: Use String.split('\n') to create a string for each row, then String.split(delimiter) to separate the values in each row. Omit the second argument, delimiter, to use a default delimiter of ,. Omit the third argument, omitFirstRow, to include the first row (title row) of the CSV string.
- Use Array.prototype.slice() and Array.prototype.indexOf('\n') to remove the first row (title row) if omitFirstRow is true.
- Use String.prototype.split('\n') to create a string for each row, then String.prototype.split(delimiter) to separate the values in each row.
- Omit the second argument, delimiter, to use a default delimiter of ,.
- Omit the third argument, omitFirstRow, to include the first row (title row) of the CSV string.
Sample Solution:
JavaScript Code:
//#Source https://bit.ly/2neWfJ2
const csv_to_array = (data, delimiter = ',', omitFirstRow = false) =>
data
.slice(omitFirstRow ? data.indexOf('\n') + 1 : 0)
.split('\n')
.map(v => v.split(delimiter));
console.log(csv_to_array('a,b\nc,d'));
console.log(csv_to_array('a;b\nc;d', ';'));
console.log(csv_to_array('head1,head2\na,b\nc,d', ',', true));
Sample Output:
[["a","b"],["c","d"]] [["a","b"],["c","d"]] [["a","b"],["c","d"]]
Flowchart:

Live Demo:
See the Pen javascript-basic-exercise-1-3 by w3resource (@w3resource) on CodePen.
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Previous: Write a JavaScript program to copy a string to the clipboard.
Next: Write a JavaScript program to convert a comma-separated values (CSV) string to a 2D array of objects. The first row of the string is used as the title row.
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JavaScript: Tips of the Day
Returns an array of n-tuples of consecutive elements
Example:
const tips_arr = (n, arr) => n > arr.length ? [] : arr.slice(n - 1).map((v, i) =>[...arr.slice(i, i + n - 1), v]); console.log(tips_arr(2, [1, 2, 3, 4, 5])); console.log(tips_arr(3, [1, 2, 3, 4, 5])); console.log(tips_arr(5, [1, 2, 3, 4]));
Output:
[[1, 2], [2, 3], [3, 4], [4, 5]] [[1, 2, 3], [2, 3, 4], [3, 4, 5]] []
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