start grid

lib/utility.js

@@ -9,6 +9,28 @@ function isPositive(n) {
     return !isNaN(n) && n > 0;
 }
 
+function isMobile() {
+    return /mobile/i.test(navigator.userAgent);
+}
+
+function throttle(method, delay = 100, context = g, ...args) {
+    if (method == null) {
+        return;
+    }
+    method.tiid && clearTimeout(method.tiid);
+    const current = new Date();
+    if (method.tdate == null || current - method.tdate > delay) {
+        method.apply(context, args);
+        method.tdate = current;
+    } else {
+        method.tiid = setTimeout(() => method.apply(context, args), delay);
+    }
+}
+
+function truncate(v) {
+    return (v > 0 ? Math.floor : Math.ceil)(v);
+}
+
 export {
     // cookie
     getCookie,
@@ -29,5 +51,9 @@ export {
     padStart,
     // variables
     g as global,
-    isPositive
+    isPositive,
+    isMobile,
+    // functions
+    throttle,
+    truncate
 }