ES2015 `Array#findIndex()` ponyfill
## Usage
Like Array#findIndex but searches the array backwards.
Lightweight Array.prototype.findIndex Polyfill. ES5. IE9+
Simple ES6 Array.prototype.findIndex polyfill for older environments.
Like Array#findIndex() but return all indexes
finds an item in an array matching a predicate function, and returns its index
Estlint rule - no async callbacks for array methods
The lodash method `_.findIndex` exported as a module.
Finds index of leftmost value passing a test.
Collection of utility functions
Array.prototype.findIndex ES2015 polyfill.
Finds index of leftmost value passing a test.
Finds indices of values passing a test.
Array manipulation, ordering, searching, summarizing, etc.
ES6 Array.findIndex() ponyfill
Finds indices of values passing a test.
Array.prototype.findIndex ES6 polyfill for ES5 versions and lower.
Robustly get the byte offset of a Typed Array
`Array.prototype.concat`, but made safe by ignoring Symbol.isConcatSpreadable
Get the ArrayBuffer out of a TypedArray, robustly.
Which kind of Typed Array is this JavaScript value? Works cross-realm, without `instanceof`, and despite Symbol.toStringTag.
A simple list of possible Typed Array names.
An ES7/ES2016 spec-compliant `Array.prototype.includes` shim/polyfill/replacement that works as far down as ES3.