Shortest way to strip the commas from column n given a .csv file/input
JavaScript (ES6), 95 93 90 bytes
Takes the content of the CSV file as its first parameter and the column index as its second parameter, with currying syntax.


let f =

s=&gt;n=&gt;s.split(/("[^"]*")/).map(c=&gt;(c&lt;' '?(k=0,c):k++-n*2?c:c.split`,`.join``),k=-1).join``

console.log(f(
`"apple","banana","apple,banana","orange"
"grape","orange","grape,orange","sprout"
`)(2));