dbounce.js

Basic thread-wide de-bounce helper
git clone git://git.finwo.net/lib/dbounce.js
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index.js (913B)

      1 const M    = require('../');
      2 const test = require('tape');
      3 
      4 const running = {};
      5 
      6 async function worker(name) {
      7   running[name] = running[name] || 0;
      8   await M.lock(name);
      9   running[name]++;
     10   await new Promise(r => setTimeout(r,1000));
     11   M.unlock(name);
     12 }
     13 
     14 test('Method exports', t => {
     15   t.plan(1);
     16 
     17   t.equal(typeof M.dbounce, 'function', '\'dbounce\' must be a function');
     18 });
     19 
     20 test('Quick burst of calls returns single true', async t => {
     21   t.plan(1);
     22   let timesCalled = 0;
     23 
     24   // Debounced function
     25   async function callHandler() {
     26     if (!await M.dbounce(`callHandler`, 50)) return;
     27     timesCalled++;
     28   }
     29 
     30   // Call a bunch of times
     31   for(let i=0; i<10; i++) {
     32     callHandler();
     33   }
     34 
     35   // Wait for it to finish
     36   await new Promise(r => setTimeout(r,1000));
     37 
     38   // callHandler should've only been called once
     39   t.equal(timesCalled, 1, 'dbounce returns true a single time for quick consecutive calls');
     40 });