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Copy pathnumber.ts
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192 lines (176 loc) · 4.79 KB
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/// ------------------------------- HANDY NUMBER © HandyScript 6m/2d/23y -------------------------------
import Math from "./math";
declare global {
interface Number {
/**
* Returns a string representation of a number in human readable format. like 1K, 1M, 1B, 1T, etc.
*/
toHuman(): string;
/**
* Returns a string representation of a number readable format. like 10-000, 1-000-000, 1-000-000-000, etc.
* @param separator The separator to be used. Default is `-`
*/
toReadable(separator?: string): string;
/**
* Converts an integer into words.
* If number is decimal, the decimals will be removed.
* @example number = 12
* number.toWords() => 'twelve'
* @param {number|string} number
* @returns {string}
*/
toWords(): string;
/**
* is a finity number
* @example number = 10
* number.isFinite() => true
* @param {number|string} number
* @returns {boolean}
*/
isFinite(): boolean;
/**
* is a save number
* @example
* number1 = 10
* number2 = Number.MAX_SAFE_INTEGER + 1 || - Number.MAX_SAFE_INTEGER -1
* number1.isSafeNumber() => true
* number2.isSafeNumber() => false
* @param {number|string} number
* @returns {boolean}
*/
isSafeNumber(): boolean;
}
}
Number.prototype.toHuman = function (): string {
const num = this.valueOf();
const si = [
{ value: 1, symbol: "" },
{ value: 1e3, symbol: "K" },
{ value: 1e6, symbol: "M" },
{ value: 1e9, symbol: "B" },
{ value: 1e12, symbol: "T" },
{ value: 1e15, symbol: "P" },
{ value: 1e18, symbol: "E" }
];
const rx = /\.0+$|(\.[0-9]*[1-9])0+$/;
let i;
for (i = si.length - 1; i > 0; i--) if (num >= si[i].value) break;
return (num / si[i].value).toFixed(2).replace(rx, "$1") + si[i].symbol;
};
Number.prototype.toReadable = function (separator = "-"): string {
const num = this.valueOf();
const rx = /(\d+)(\d{3})/;
return String(num).replace(/^\d+/, function (w) {
while (rx.test(w)) {
w = w.replace(rx, "$1" + separator + "$2");
}
return w;
});
};
Number.prototype.isFinite = function (): boolean {
return !(
typeof this !== "number" ||
this !== this ||
this === Infinity ||
this === -Infinity
);
};
Number.prototype.isSafeNumber = function (): boolean {
return typeof this === "number" && Math.abs(this) <= Number.MAX_SAFE_INTEGER;
};
Number.prototype.toWords = function (): string {
const number = this.valueOf();
const LESS_THAN_TWENTY = [
"zero",
"one",
"two",
"three",
"four",
"five",
"six",
"seven",
"eight",
"nine",
"ten",
"eleven",
"twelve",
"thirteen",
"fourteen",
"fifteen",
"sixteen",
"seventeen",
"eighteen",
"nineteen",
];
const TENTHS_LESS_THAN_HUNDRED = [
"zero",
"ten",
"twenty",
"thirty",
"forty",
"fifty",
"sixty",
"seventy",
"eighty",
"ninety",
];
if (!number.isFinite()) {
throw new TypeError(
"Not a finite number: " + number + " (" + typeof number + ")"
);
}
if (!number.isSafeNumber()) {
throw new RangeError(
"Input is not a safe number, it’s either too large or too small."
);
}
const generateWords = function (number: number, words?: Array<string | undefined>): string {
let remainder, word;
// We’re done
if (number === 0) {
return !words ? "zero" : words.join(" ").replace(/,$/, "");
}
// First run
if (!words) words = [];
// If negative, prepend “minus”
if (number < 0) {
words.push("minus");
number = Math.abs(number);
}
if (number < 20) {
remainder = 0;
word = LESS_THAN_TWENTY[number];
} else if (number < Math.HUNDRED) {
remainder = number % Math.TEN;
word = TENTHS_LESS_THAN_HUNDRED[Math.floor(number / Math.TEN)];
// In case of remainder, we need to handle it here to be able to add the “-”
if (remainder) {
word += "-" + LESS_THAN_TWENTY[remainder];
remainder = 0;
}
} else if (number < Math.THOUSAND) {
remainder = number % Math.HUNDRED;
word = generateWords(Math.floor(number / Math.HUNDRED)) + " hundred";
} else if (number < Math.MILLION) {
remainder = number % Math.THOUSAND;
word = generateWords(Math.floor(number / Math.THOUSAND)) + " thousand,";
} else if (number < Math.BILLION) {
remainder = number % Math.MILLION;
word = generateWords(Math.floor(number / Math.MILLION)) + " million,";
} else if (number < Math.TRILLION) {
remainder = number % Math.BILLION;
word = generateWords(Math.floor(number / Math.BILLION)) + " billion,";
} else if (number < Math.QUADRILLION) {
remainder = number % Math.TRILLION;
word = generateWords(Math.floor(number / Math.TRILLION)) + " trillion,";
} else {
remainder = number % Math.QUADRILLION;
word =
generateWords(Math.floor(number / Math.QUADRILLION)) + " quadrillion,";
}
words.push(word);
return generateWords(remainder, words);
};
return generateWords(number);
};
export default Number;