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join javascript Code Snippet in 2024

arrayintermediate

Last Updated: 12 April 2024

Joins all elements of an array into a string and returns this string. Uses a separator and an end separator.

  • Use Array.prototype.reduce() to combine elements into a string.
  • Omit the second argument, separator, to use a default separator of ','.
  • Omit the third argument, end, to use the same value as separator by default.
const join = (arr, separator = ',', end = separator) => arr.reduce( (acc, val, i) => i === arr.length - 2 ? acc + val + end : i === arr.length - 1 ? acc + val : acc + val + separator, '' );
join(['pen', 'pineapple', 'apple', 'pen'],',','&'); // 'pen,pineapple,apple&pen' join(['pen', 'pineapple', 'apple', 'pen'], ','); // 'pen,pineapple,apple,pen' join(['pen', 'pineapple', 'apple', 'pen']); // 'pen,pineapple,apple,pen'

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