functionfoundry/fn/lookup.js

Pure function JavaScript library

'use strict';

Object.defineProperty(exports, "__esModule", {
    value: true
});
exports.default = lookup;
// Copyright 2015 JC Fisher

// LOOKUP find a value in an array.
function lookup() {
    var lookup_value, lookup_array, lookup_vector, results_vector;
    if (arguments.length === 2) {
        // array form
        var wide = false;

        lookup_value = arguments[0].valueOf();
        lookup_array = arguments[1];

        for (var i = 0; i < lookup_array.length; i++) {
            if (typeof lookup_array[i] !== 'undefined' && lookup_value === lookup_array[i].valueOf()) {
                return lookup_array[i];
            }
        }
    } else if (arguments.length === 3) {
        // vector form`
        lookup_value = arguments[0].valueOf();
        lookup_vector = arguments[1];
        results_vector = arguments[2];

        for (var i = 0; i < lookup_vector.length; i++) {
            if (typeof lookup_vector[i] !== 'undefined' && lookup_value === lookup_vector[i].valueOf()) {
                return results_vector[i];
            }
        }
    }

    return error.na;
}
module.exports = exports['default'];