@extra-lists/index-of v1.1.1

Get first index of value in lists, like Array.indexOf().

const indexOf = require('@extra-lists/index-of');
// indexOf(<lists>, <search value>)

a = ['sleeping dart', 'noisemaker', 'emp'];
indexOf([a.keys(), a], 'emp');
// 2
a = {u1: 'goggles', u2: 'torso', u3: 'arms'};
indexOf([Object.keys(a), Object.values(a)], 'torso');
// 'u2'