Function findIndex

Find the index of the first value which matches a predicate.

Returns

The index of the first matching value, or -1 if no matching value is found.

Complexity

Linear.

Example

import { findIndex } from '@lumino/algorithm';

interface IAnimal { species: string, name: string };

function isCat(value: IAnimal): boolean {
  return value.species === 'cat';
}

let data: IAnimal[] = [
  { species: 'dog', name: 'spot' },
  { species: 'cat', name: 'fluffy' },
  { species: 'alligator', name: 'pocho' }
];

findIndex(data, isCat);  // 1