1

What is the best way to toggle an item in an array using TypeScript.

With toggle I mean:

  • If present, remove the value.
  • If not present, add the value.

Solution with least amount of computational effort preferred.

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1 Answer 1

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2

Below is a generic typesafe method that "toggles" a value in an array. Note that the method returns a new array, and doesn't mutate the original one.

const toggle = <T extends unknown>(array: Array<T>, value: T) => {
  const newArray = array.filter((x) => x !== value)
  if (newArray.length === array.length) return array.concat(value)
  return newArray
}
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