locutus/python/_helpers/_statistics.js

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

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.assertStatisticsArray = assertStatisticsArray;
exports.toNumericSequence = toNumericSequence;
exports.toStatisticNumber = toStatisticNumber;
exports.sortStatisticsValues = sortStatisticsValues;
exports.statisticsMeanFromSequence = statisticsMeanFromSequence;
exports.statisticsVarianceFromSequence = statisticsVarianceFromSequence;
exports.sumNumbers = sumNumbers;
exports.sumProducts = sumProducts;
exports.isIntegralStatisticValue = isIntegralStatisticValue;
exports.toFloatStatisticNumber = toFloatStatisticNumber;
function assertStatisticsArray(data, functionName) {
    if (!Array.isArray(data)) {
        throw new TypeError(`${functionName}() data must be an array`);
    }
    return data;
}
function toNumericSequence(data, functionName) {
    const values = assertStatisticsArray(data, functionName);
    return {
        values: values.map((value) => toStatisticNumber(value, functionName)),
        integral: values.every(isIntegralStatisticValue),
    };
}
function toStatisticNumber(value, functionName) {
    if (typeof value === 'number') {
        return value;
    }
    if (typeof value === 'boolean') {
        return value ? 1 : 0;
    }
    if (typeof value === 'bigint') {
        const numericValue = Number(value);
        if (!Number.isSafeInteger(numericValue)) {
            throw new RangeError(`${functionName}() bigint values must fit within JS safe integers`);
        }
        return numericValue;
    }
    throw new TypeError(`${functionName}() data must contain only real numbers`);
}
function sortStatisticsValues(data, functionName) {
    const values = assertStatisticsArray(data, functionName);
    if (values.length === 0) {
        return [];
    }
    const firstKind = getStatisticsSortKind(values[0], functionName);
    for (let index = 1; index < values.length; index += 1) {
        const currentKind = getStatisticsSortKind(values[index], functionName);
        if (currentKind !== firstKind) {
            throw new TypeError(`${functionName}() requires data values that can be ordered together`);
        }
    }
    return [...values].sort((left, right) => compareStatisticsValues(left, right, firstKind));
}
function statisticsMeanFromSequence(sequence, preferFloat = false) {
    return divideStatisticsValue(sumNumbers(sequence.values), sequence.values.length, sequence.integral, preferFloat);
}
function statisticsVarianceFromSequence(sequence, divisor, functionName, center) {
    const mean = center === undefined ? statisticsMeanFromSequence(sequence) : toStatisticNumber(center, functionName);
    const squaredDeltaSum = sequence.values.reduce((sum, value) => {
        const delta = value - mean;
        return sum + delta * delta;
    }, 0);
    return divideStatisticsValue(squaredDeltaSum, divisor, sequence.integral);
}
function sumNumbers(values) {
    return values.reduce((sum, value) => sum + value, 0);
}
function sumProducts(left, right) {
    let total = 0;
    for (let index = 0; index < left.length; index += 1) {
        total += (left[index] ?? 0) * (right[index] ?? 0);
    }
    return total;
}
function isIntegralStatisticValue(value) {
    return (typeof value === 'boolean' || typeof value === 'bigint' || (typeof value === 'number' && Number.isInteger(value)));
}
function toFloatStatisticNumber(value, functionName) {
    if (typeof value === 'number') {
        return value;
    }
    if (typeof value === 'boolean') {
        return value ? 1 : 0;
    }
    if (typeof value === 'bigint') {
        return Number(value);
    }
    if (typeof value === 'string') {
        const parsed = Number(value);
        if (!Number.isNaN(parsed)) {
            return parsed;
        }
        throw new TypeError('Value cannot be converted to a float');
    }
    throw new TypeError(`${functionName}() data must contain only real numbers`);
}
function divideStatisticsValue(total, divisor, integral, preferFloat = false) {
    if (!preferFloat && integral && Number.isSafeInteger(total) && total % divisor === 0) {
        return total / divisor;
    }
    return total / divisor;
}
function getStatisticsSortKind(value, functionName) {
    if (typeof value === 'string') {
        return 'string';
    }
    if (typeof value === 'number' || typeof value === 'boolean' || typeof value === 'bigint') {
        return 'number';
    }
    throw new TypeError(`${functionName}() requires sortable scalar values`);
}
function compareStatisticsValues(left, right, kind) {
    if (kind === 'string') {
        return String(left).localeCompare(String(right));
    }
    return toNumericSortValue(left) - toNumericSortValue(right);
}
function toNumericSortValue(value) {
    return typeof value === 'boolean' ? (value ? 1 : 0) : Number(value);
}