code refactor

src/lib/utils.js

@@ -0,0 +1,36 @@
+function isFunction(val) {
+    return typeof(val) === 'function';
+}
+
+function isObject(val) {
+    return val != null && typeof(val) === 'object';
+}
+
+function isArray(val) {
+    if (isFunction(Array.isArray)) {
+        return Array.isArray(val);
+    }
+
+    return Object.prototype.toString.call(val) === '[object Array]';
+}
+
+function isString(val) {
+    return typeof(val) === 'string';
+}
+
+function isNumber(val) {
+    return typeof(val) === 'number';
+}
+
+function isBoolean(val) {
+    return typeof(val) === 'boolean';
+}
+
+export default {
+    isFunction,
+    isObject,
+    isArray,
+    isString,
+    isNumber,
+    isBoolean,
+};