From 9350c837e57a9d7ce20cdfd187b1172aea4a33f9 Mon Sep 17 00:00:00 2001
From: ztimson <zaktimson@gmail.com>
Date: Mon, 27 May 2024 13:51:41 -0400
Subject: [PATCH] Added math functions

---
 package.json |  2 +-
 src/index.ts |  1 +
 src/math.ts  | 45 +++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 47 insertions(+), 1 deletion(-)
 create mode 100644 src/math.ts

diff --git a/package.json b/package.json
index c45b50e..2014d58 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
 	"name": "@ztimson/utils",
-	"version": "0.9.0",
+	"version": "0.10.0",
 	"description": "Utility library",
 	"author": "Zak Timson",
 	"license": "MIT",
diff --git a/src/index.ts b/src/index.ts
index a705372..c78143c 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -4,6 +4,7 @@ export * from './download';
 export * from './emitter';
 export * from './errors';
 export * from './logger';
+export * from './math';
 export * from './misc';
 export * from './objects';
 export * from './promise-progress';
diff --git a/src/math.ts b/src/math.ts
new file mode 100644
index 0000000..5b79f74
--- /dev/null
+++ b/src/math.ts
@@ -0,0 +1,45 @@
+/**
+ * Convert decimal number to fraction
+ *
+ * @example
+ * ```js
+ * dec2Frac(1.25) // Outputs: "1 1/4"
+ * ```
+ *
+ * @param {number} num Number to convert
+ * @return {string} Fraction with remainder
+ */
+export function dec2Frac(num: number) {
+	const gcd = (a: number, b: number): number => {
+		if (b < 0.0000001) return a;
+		return gcd(b, ~~(a % b));
+	};
+
+	const len = num.toString().length - 2;
+	let denominator = Math.pow(10, len);
+	let numerator = num * denominator;
+	const divisor = gcd(numerator, denominator);
+	numerator = ~~(numerator / divisor);
+	denominator = ~~(denominator / divisor)
+	const remainder = ~~(numerator / denominator);
+	numerator -= remainder * denominator;
+	return `${remainder ? remainder + ' ' : ''}${~~(numerator)}/${~~(denominator)}`;
+}
+
+/**
+ * Convert fraction to decimal number
+ *
+ * @example
+ * ```js
+ * fracToDec('1 1/4') // Outputs: 1.25
+ * ```
+ *
+ * @param {string} frac Fraction to convert
+ * @return {number} Faction as a decimal
+ */
+export function fracToDec(frac: string) {
+	let split = frac.split(' ');
+	const whole = split.length == 2 ? Number(split[0]) : 0;
+	split = (<string>split.pop()).split('/');
+	return whole + (Number(split[0]) / Number(split[1]));
+}