move utils to individual files; export from index

Author: jscottsmith

src/utils/clamp.js

@@ -0,0 +1,5 @@
+export default function clamp(number, lower, upper) {
+    number = number <= upper ? number : upper;
+    number = number >= lower ? number : lower;
+    return number;
+}

src/utils/index.js

@@ -1,13 +1,7 @@
-// normalize
-export function scaleBetween(unscaledNum, minAllowed, maxAllowed, min, max) {
-    return (maxAllowed - minAllowed) * (unscaledNum - min) / (max - min) + minAllowed;
-}
-
-export function clamp(number, lower, upper) {
-    number = number <= upper ? number : upper;
-    number = number >= lower ? number : lower;
-    return number;
-}
+export clamp from './clamp';
+export getParallaxOffsets from './getParallaxOffsets';
+export parseValueAndUnit from './parseValueAndUnit';
+export scaleBetween from './scaleBetween';
 
 export function testForPassiveScroll() {
     let supportsPassiveOption = false;
@@ -23,43 +17,3 @@ export function testForPassiveScroll() {
     return supportsPassiveOption;
 }
 
-/**
- * Determines the unit of a string and parses the value
- *
- * @param {string} value
- * @return {object} The parsed value and the unit if any
- */
-export function parseValueAndUnit(value) {
-    const isBool = typeof value === 'boolean';
-    const isObject = typeof value === 'object';
-    const isString = typeof value === 'string';
-    const isNumb = typeof value === 'number';
-
-    if (isBool || isObject) {
-        throw new Error('Ivalid value provided. Must provide a value as a string with % or px units.');
-    }
-
-    if (isNumb) {
-        return {
-            value,
-            unit: null,
-        };
-    } else if (isString && value.slice(-1) === '%') {
-        // remove % then parse
-        value = parseInt(value.slice(0, -1), 10);
-
-        return {
-            value,
-            unit: '%',
-        };
-    } else if (isString && value.slice(-2) === 'px') {
-        // remove px then parse
-        value = parseInt(value.slice(0, -2), 10);
-
-        return {
-            value,
-            unit: 'px',
-        };
-    }
-
-}

src/utils/parseValueAndUnit.js

@@ -0,0 +1,39 @@
+/**
+ * Determines the unit of a string and parses the value
+ *
+ * @param {string} value
+ * @return {object} The parsed value and the unit if any
+ */
+export default function parseValueAndUnit(value) {
+    const isBool = typeof value === 'boolean';
+    const isObject = typeof value === 'object';
+    const isString = typeof value === 'string';
+    const isNumb = typeof value === 'number';
+
+    if (isBool || isObject) {
+        throw new Error('Ivalid value provided. Must provide a value as a string with % or px units.');
+    }
+
+    if (isNumb) {
+        return {
+            value,
+            unit: '%', // defaults to percent if not unit is passed
+        };
+    } else if (isString && value.slice(-1) === '%') {
+        // remove % then parse
+        value = parseInt(value.slice(0, -1), 10);
+
+        return {
+            value,
+            unit: '%',
+        };
+    } else if (isString && value.slice(-2) === 'px') {
+        // remove px then parse
+        value = parseInt(value.slice(0, -2), 10);
+
+        return {
+            value,
+            unit: 'px',
+        };
+    }
+}

src/utils/scaleBetween.js

@@ -0,0 +1,4 @@
+// Scale between AKA normalize
+export default function scaleBetween(value, newMin, newMax, oldMin, oldMax) {
+    return (newMax - newMin) * (value - oldMin) / (oldMax - oldMin) + newMin;
+}