Module array/findIndex

findIndex

• findIndex<T>(fn: ArrPred<T>, list: ArrayLike<T>): number
• findIndex<T>(fn: ArrPred<T>): (list: ArrayLike<T>) => number

• Returns the index of the first element of the list which matches the predicate, or -1 if no element matches.

  example

   var xs = [{a: 1}, {a: 2}, {a: 3}];
   findIndex(x => x.a === 2)(xs); //=> 1
   findIndex(x => x.a === 4)(xs); //=> -1
  

  Type parameters

  • T

  Parameters

  • fn: ArrPred<T>

    The predicate function used to determine if the element is the desired one.

  • list: ArrayLike<T>

  Returns number

  The index of the element found, or -1.

• Returns the index of the first element of the list which matches the predicate, or -1 if no element matches.

  example

   var xs = [{a: 1}, {a: 2}, {a: 3}];
   findIndex(x => x.a === 2)(xs); //=> 1
   findIndex(x => x.a === 4)(xs); //=> -1
  

  Type parameters

  • T

  Parameters

  • fn: ArrPred<T>

    The predicate function used to determine if the element is the desired one.

  Returns (list: ArrayLike<T>) => number

  The index of the element found, or -1.

  • • (list: ArrayLike<T>): number

    • Parameters

      • list: ArrayLike<T>

      Returns number