@reactivex/ix-esnext-esm/iterable/findindex.js

The Interactive Extensions for JavaScript

import { bindCallback } from '../util/bindcallback';
export function findIndex(source, predicate, thisArg) {
    if (typeof predicate !== 'function') {
        throw new TypeError();
    }
    const f = bindCallback(predicate, thisArg, 2);
    let i = 0;
    for (const item of source) {
        if (f(item, i++)) {
            return i;
        }
    }
    return -1;
}

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