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-rw-r--r--school/node_modules/axios/lib/helpers/throttle.js33
1 files changed, 33 insertions, 0 deletions
diff --git a/school/node_modules/axios/lib/helpers/throttle.js b/school/node_modules/axios/lib/helpers/throttle.js
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+++ b/school/node_modules/axios/lib/helpers/throttle.js
@@ -0,0 +1,33 @@
+'use strict';
+
+/**
+ * Throttle decorator
+ * @param {Function} fn
+ * @param {Number} freq
+ * @return {Function}
+ */
+function throttle(fn, freq) {
+ let timestamp = 0;
+ const threshold = 1000 / freq;
+ let timer = null;
+ return function throttled(force, args) {
+ const now = Date.now();
+ if (force || now - timestamp > threshold) {
+ if (timer) {
+ clearTimeout(timer);
+ timer = null;
+ }
+ timestamp = now;
+ return fn.apply(null, args);
+ }
+ if (!timer) {
+ timer = setTimeout(() => {
+ timer = null;
+ timestamp = Date.now();
+ return fn.apply(null, args);
+ }, threshold - (now - timestamp));
+ }
+ };
+}
+
+export default throttle;