@woosh/meep-engine/src/core/collection/array/array_index_by_equality.js

Pure JavaScript game engine. Fully featured and production ready.

/**
 * Works similarly to `Array.prototype.indexOf`, but instead of strict equality - uses provided equality method
 * @template T
 * @param {T[]} array
 * @param {T} element
 * @param {function(a:T,b:T):boolean} equals
 * @returns {number} index of first match or -1 if no matches found
 */
export function array_index_by_equality(array, element, equals) {
    const n = array.length;

    for (let i = 0; i < n; i++) {
        const el = array[i];

        if (equals(element, el)) {
            return i;
        }
    }

    return -1;
}