nerdamer-ts/dist/Functions/Core/math/round.js

javascript light-weight symbolic math expression evaluator

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.round = void 0;
const abs_1 = require("./abs");
const Symbol_1 = require("../../../Types/Symbol");
const Utils_1 = require("../../../Core/Utils");
const index_1 = require("../index");
/**
 * Round a number up to s decimal places
 * @param {Symbol} x
 * @param {int} s - the number of decimal places
 * @returns {undefined}
 */
function round(x, s) {
    var sIsConstant = s && s.isConstant() || typeof s === 'undefined';
    if (x.isConstant() && sIsConstant) {
        var v, e, exp, retval;
        v = x;
        //round the coefficient of then number but not the actual decimal value
        //we know this because a negative number was passed
        if (s && s.lessThan(0)) {
            s = (0, abs_1.abs)(s);
            //convert the number to exponential form
            e = Number(x).toExponential().toString().split('e');
            //point v to the coefficient of then number
            v = e[0];
            //set the expontent
            exp = e[1];
        }
        //round the number to the requested precision
        retval = new Symbol_1.Symbol((0, Utils_1.nround)(v, Number(s || 0)));
        //if there's a exponent then put it back
        return (0, index_1.multiply)(retval, (0, index_1.pow)(new Symbol_1.Symbol(10), new Symbol_1.Symbol(exp || 0)));
    }
    return (0, Symbol_1.symfunction)('round', arguments);
}
exports.round = round;
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