jssm-util.js

'use strict';

Object.defineProperty(exports, "__esModule", {
    value: true
});

var _typeof = typeof Symbol === "function" && typeof Symbol.iterator === "symbol" ? function (obj) { return typeof obj; } : function (obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; };

// this is explicitly about other peoples' data, so it has to be weakly typed
var weighted_rand_select = function weighted_rand_select(options) {
    var probability_property = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 'probability';


    if (!Array.isArray(options)) {
        throw new TypeError('options must be a non-empty array of objects');
    }

    if (!(_typeof(options[0]) === 'object')) {
        throw new TypeError('options must be a non-empty array of objects');
    }

    var frand = function frand(cap) {
        return Math.random() * cap;
    },
        or_one = function or_one(item) {
        return item === undefined ? 1 : item;
    },
        prob_sum = options.reduce(function (acc, val) {
        return acc + or_one(val[probability_property]);
    }, 0),
        rnd = frand(prob_sum);

    var cursor = 0,
        cursor_sum = 0;

    while ((cursor_sum += or_one(options[cursor++][probability_property])) <= rnd) {} // eslint-disable-line no-empty,fp/no-loops
    return options[cursor - 1];
};
/* eslint-enable flowtype/no-weak-types */

var seq = function seq(n) {
    return new Array(n).fill(true).map(function (_, i) {
        return i;
    });
};

var histograph = function histograph(a // eslint-disable-line flowtype/no-weak-types

) {
    return a.sort().reduce(function (m, v) {
        return m.set(v, m.has(v) ? m.get(v) + 1 : 1), m;
    }, new Map());
}; // eslint-disable-line flowtype/no-weak-types,no-sequences


var weighted_sample_select = function weighted_sample_select(n, options, probability_property // eslint-disable-line flowtype/no-weak-types

) {
    return seq(n).map(function (_i) {
        return weighted_rand_select(options, probability_property);
    });
}; // eslint-disable-line flowtype/no-weak-types


var weighted_histo_key = function weighted_histo_key(n, opts, prob_prop, extract // eslint-disable-line flowtype/no-weak-types

) {
    return histograph(weighted_sample_select(n, opts, prob_prop).map(function (s) {
        return s[extract];
    }));
}; // eslint-disable-line flowtype/no-weak-types


exports.seq = seq;
exports.histograph = histograph;
exports.weighted_histo_key = weighted_histo_key;
exports.weighted_rand_select = weighted_rand_select;
exports.weighted_sample_select = weighted_sample_select;
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