Remove last comma (and possible whitespaces after the last comma) from the end of a string

by

This will remove the last comma and any whitespace after it:

str = str.replace(/,\s*$/, "");

It uses a regular expression:

  • The / mark the beginning and end of the regular expression

  • The , matches the comma

  • The \s means whitespace characters (space, tab, etc) and the * means 0 or more

  • The $ at the end signifies the end of the string

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