locutus/julia/Base/findall.js

Locutus other languages' standard libraries to JavaScript for fun and educational purposes

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.findall = findall;
function findall(matcher, values) {
    //      discuss at: https://locutus.io/julia/findall/
    // parity verified: Julia 1.11
    //     original by: Kevin van Zonneveld (https://kvz.io)
    //          note 1: Returns 1-based indices of matches in the array, similar to Julia findall.
    //       example 1: findall(2, [1, 2, 3, 2, 4, 2])
    //       returns 1: [2, 4, 6]
    //       example 2: findall('a', ['a', 'b', 'a', 'c'])
    //       returns 2: [1, 3]
    //       example 3: findall((value) => Number(value) > 2, [1, 2, 3, 4, 5])
    //       returns 3: [3, 4, 5]
    if (!Array.isArray(values)) {
        return [];
    }
    const predicate = typeof matcher === 'function' ? matcher : (value) => Object.is(value, matcher);
    const out = [];
    for (let i = 0; i < values.length; i++) {
        if (predicate(values[i], i, values)) {
            out.push(i + 1);
        }
    }
    return out;
}