Add small math function library

smath/src/SMath.ts

@@ -0,0 +1,39 @@
+/**
+ * Small Math function library
+ */
+export class SMath {
+    /**
+     * Determine if a value is numeric.
+     * @param n Any value to check
+     * @returns True if `n` is a number
+     */
+    public static isNumber(n: any): boolean {
+        return typeof n === 'number';
+    }
+    /**
+     * Clamp a number within a range.
+     * @param n The number to clamp
+     * @param min The minimum value of the range
+     * @param max The maximum value of the range
+     * @returns A clamped number
+     */
+    public static clamp(n: number, min: number, max: number): number {
+        if (n < min) {
+            return min;
+        }
+        if (n > max) {
+            return max;
+        }
+        return n;
+    }
+    /**
+     * Check if two numbers are approximately equal with a maximum abolute error.
+     * @param a Any number
+     * @param b Any number
+     * @param epsilon Maximum absolute error
+     * @returns True if `a` is approximately `b`
+     */
+    public static approx(a: number, b: number, epsilon: number = 1e-6): boolean {
+        return a - b < epsilon && b - a < epsilon;
+    }
+}