Function pairs

pairs<T>(iterable): [T, T][]
For each adjacent pair of elements in the specified array, returns a new array of tuples of elements i and i - 1. Returns the empty array if the input array has fewer than two elements.
Type Parameters
- T
Parameters
- iterable: Iterable<T>
  Array of input elements
Returns [T, T][]
pairs<T, U>(iterable, reducer): U[]
For each adjacent pair of elements in the specified array, in order, invokes the specified reducer function passing the element i and element i - 1. Returns the resulting array of pair-wise reduced elements. Returns the empty array if the input array has fewer than two elements.
Type Parameters
- T
- U
Parameters
- iterable: Iterable<T>
  Array of input elements
- reducer: ((a, b) => U)
  A reducer function taking as input to adjacent elements of the input array and returning a reduced value.
  - - (a, b): U
    - Parameters
      a: T
      b: T
      Returns U
Returns U[]