feat(util): add debounce util

nextgis · Jan 28, 2020 · c89223e · c89223e
1 parent fb0e502
commit c89223e
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Showing 3 changed files with 53 additions and 44 deletions.
diff --git a/packages/utils/src/debounce.ts b/packages/utils/src/debounce.ts
@@ -0,0 +1,8 @@
+export function debounce<T extends Function>(cb: T, wait = 10) {
+  let h = 0;
+  const callable = (...args: any) => {
+    clearTimeout(h);
+    h = window.setTimeout(() => cb(...args), wait);
+  };
+  return (callable as any) as T;
+}
diff --git a/packages/utils/src/deepmerge.ts b/packages/utils/src/deepmerge.ts
@@ -0,0 +1,43 @@
+export function deepmerge(target: any, src: any, mergeArray = false): any {
+  const array = Array.isArray(src);
+  let dst: any = (array && []) || {};
+
+  if (array) {
+    if (mergeArray) {
+      target = target || [];
+      dst = dst.concat(target);
+      src.forEach(function(e: any, i: any) {
+        if (typeof dst[i] === 'undefined') {
+          dst[i] = e;
+        } else if (typeof e === 'object') {
+          dst[i] = deepmerge(target[i], e, mergeArray);
+        } else {
+          if (target.indexOf(e) === -1) {
+            dst.push(e);
+          }
+        }
+      });
+    } else {
+      // Replace array. Do not merge by default
+      dst = src;
+    }
+  } else {
+    if (target && typeof target === 'object') {
+      Object.keys(target).forEach(function(key) {
+        dst[key] = target[key];
+      });
+    }
+    Object.keys(src).forEach(function(key) {
+      if (typeof src[key] !== 'object' || !src[key]) {
+        dst[key] = src[key];
+      } else {
+        if (typeof target[key] === 'object' && typeof src[key] === 'object') {
+          dst[key] = deepmerge(target[key], src[key], mergeArray);
+        } else {
+          dst[key] = src[key];
+        }
+      }
+    });
+  }
+  return dst;
+}
diff --git a/packages/utils/src/index.ts b/packages/utils/src/index.ts
@@ -6,6 +6,8 @@ import * as Dom from './dom';
 export const dom = Dom;
 export * from './clipboard';
 export * from './events';
+export { deepmerge } from './deepmerge';
+export { debounce } from './debounce';
 /**
  * Given an array of member function names as strings, replace all of them
  * with bound versions that will always refer to `context` as `this`. This
@@ -30,47 +32,3 @@ export function fixUrlStr(url: string): string {
   // remove double slash
   return url.replace(/([^:]\/)\/+/g, '$1');
 }
-
-export function deepmerge(target: any, src: any, mergeArray = false): any {
-  const array = Array.isArray(src);
-  let dst: any = (array && []) || {};
-
-  if (array) {
-    if (mergeArray) {
-      target = target || [];
-      dst = dst.concat(target);
-      src.forEach(function(e: any, i: any) {
-        if (typeof dst[i] === 'undefined') {
-          dst[i] = e;
-        } else if (typeof e === 'object') {
-          dst[i] = deepmerge(target[i], e, mergeArray);
-        } else {
-          if (target.indexOf(e) === -1) {
-            dst.push(e);
-          }
-        }
-      });
-    } else {
-      // Replace array. Do not merge by default
-      dst = src;
-    }
-  } else {
-    if (target && typeof target === 'object') {
-      Object.keys(target).forEach(function(key) {
-        dst[key] = target[key];
-      });
-    }
-    Object.keys(src).forEach(function(key) {
-      if (typeof src[key] !== 'object' || !src[key]) {
-        dst[key] = src[key];
-      } else {
-        if (typeof target[key] === 'object' && typeof src[key] === 'object') {
-          dst[key] = deepmerge(target[key], src[key], mergeArray);
-        } else {
-          dst[key] = src[key];
-        }
-      }
-    });
-  }
-  return dst;
-}