2 var $ = require('../internals/export');
3 var global = require('../internals/global');
4 var uncurryThis = require('../internals/function-uncurry-this');
5 var toIntegerOrInfinity = require('../internals/to-integer-or-infinity');
6 var thisNumberValue = require('../internals/this-number-value');
7 var $repeat = require('../internals/string-repeat');
8 var fails = require('../internals/fails');
10 var RangeError = global.RangeError;
11 var String = global.String;
12 var floor = Math.floor;
13 var repeat = uncurryThis($repeat);
14 var stringSlice = uncurryThis(''.slice);
15 var un$ToFixed = uncurryThis(1.0.toFixed);
17 var pow = function (x, n, acc) {
18 return n === 0 ? acc : n % 2 === 1 ? pow(x, n - 1, acc * x) : pow(x * x, n / 2, acc);
21 var log = function (x) {
34 var multiply = function (data, n, c) {
38 c2 += n * data[index];
39 data[index] = c2 % 1e7;
44 var divide = function (data, n) {
47 while (--index >= 0) {
49 data[index] = floor(c / n);
54 var dataToString = function (data) {
57 while (--index >= 0) {
58 if (s !== '' || index === 0 || data[index] !== 0) {
59 var t = String(data[index]);
60 s = s === '' ? t : s + repeat('0', 7 - t.length) + t;
65 var FORCED = fails(function () {
66 return un$ToFixed(0.00008, 3) !== '0.000' ||
67 un$ToFixed(0.9, 0) !== '1' ||
68 un$ToFixed(1.255, 2) !== '1.25' ||
69 un$ToFixed(1000000000000000128.0, 0) !== '1000000000000000128';
70 }) || !fails(function () {
75 // `Number.prototype.toFixed` method
76 // https://tc39.es/ecma262/#sec-number.prototype.tofixed
77 $({ target: 'Number', proto: true, forced: FORCED }, {
78 toFixed: function toFixed(fractionDigits) {
79 var number = thisNumberValue(this);
80 var fractDigits = toIntegerOrInfinity(fractionDigits);
81 var data = [0, 0, 0, 0, 0, 0];
86 if (fractDigits < 0 || fractDigits > 20) throw RangeError('Incorrect fraction digits');
87 // eslint-disable-next-line no-self-compare -- NaN check
88 if (number != number) return 'NaN';
89 if (number <= -1e21 || number >= 1e21) return String(number);
95 e = log(number * pow(2, 69, 1)) - 69;
96 z = e < 0 ? number * pow(2, -e, 1) : number / pow(2, e, 1);
97 z *= 0x10000000000000;
100 multiply(data, 0, z);
103 multiply(data, 1e7, 0);
106 multiply(data, pow(10, j, 1), 0);
109 divide(data, 1 << 23);
112 divide(data, 1 << j);
113 multiply(data, 1, 1);
115 result = dataToString(data);
117 multiply(data, 0, z);
118 multiply(data, 1 << -e, 0);
119 result = dataToString(data) + repeat('0', fractDigits);
122 if (fractDigits > 0) {
124 result = sign + (k <= fractDigits
125 ? '0.' + repeat('0', fractDigits - k) + result
126 : stringSlice(result, 0, k - fractDigits) + '.' + stringSlice(result, k - fractDigits));
128 result = sign + result;