31 lines
1.1 KiB
Markdown
31 lines
1.1 KiB
Markdown
---
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title: CSV to array
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tags: string,array
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cover: keyboard-tea
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firstSeen: 2018-06-27T20:57:54+03:00
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lastUpdated: 2022-01-30T12:14:39+02:00
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---
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Converts a comma-separated values (CSV) string to a 2D array.
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- Use `Array.prototype.indexOf()` to find the first newline character (`\n`).
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- Use `Array.prototype.slice()` to remove the first row (title row) if `omitFirstRow` is `true`.
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- Use `String.prototype.split()` to create a string for each row.
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- Use `String.prototype.split()` to separate the values in each row, using the provided `delimiter`.
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- Omit the second argument, `delimiter`, to use a default delimiter of `','`.
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- Omit the third argument, `omitFirstRow`, to include the first row (title row) of the CSV string.
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```js
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const CSVToArray = (data, delimiter = ',', omitFirstRow = false) =>
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data
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.slice(omitFirstRow ? data.indexOf('\n') + 1 : 0)
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.split('\n')
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.map(v => v.split(delimiter));
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```
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```js
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CSVToArray('a,b\nc,d'); // [['a', 'b'], ['c', 'd']];
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CSVToArray('a;b\nc;d', ';'); // [['a', 'b'], ['c', 'd']];
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CSVToArray('col1,col2\na,b\nc,d', ',', true); // [['a', 'b'], ['c', 'd']];
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```
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