davedx · January 25, 2018 12:29 · davedx · Jan 25, 2018
diff --git a/delete vs null b/delete vs null
 let cache1 = {}, cache2 = {}

 const blob = () => {
  var d = []
  for (var i=0; i<10; i++) {
    d[i] = Math.random()
  }
  return d
 }

 let its = 100000
 console.log('iterations: '+its)

 for (var i=0; i<its; i++) {
  const idx = `key_${i}`
  cache1[idx] = blob()
  cache2[idx] = blob()
 }

 // now let's time deletions
 let t1 = Date.now()
 for (var i=0; i<its; i++) {
  delete cache1[`key_${i}`]
 }
 console.log(`delete time: ${Date.now()-t1} = ${(Date.now()-t1)/its} ms/op`)

 let t2 = Date.now()
 for (var i=0; i<its; i++) {
  cache2[`key_${i}`] = null
 }
 console.log(`null time: ${Date.now()-t2} = ${(Date.now()-t2)/its} ms/op`)