update: intermediary step to avoid dead-code elimination

bench/add-property.mjs

@@ -5,11 +5,13 @@ const suite = createBenchmarkSuite('Adding property')
 suite
   .add('Directly in the object', function () {
     const data = { test: 'Hello' }
+    return data
   })
   .add('Using dot notation', function () {
     const data = {}
 
     data.test = 'Hello'
+    return data
   })
   .add('Using define property (writable)', function () {
     const data = {}
@@ -20,6 +22,7 @@ suite
       enumerable: true,
       configurable: true,
     })
+    return data
   })
   .add('Using define property initialized (writable)', function () {
     const data = { test: undefined }
@@ -29,6 +32,7 @@ suite
       enumerable: true,
       configurable: true,
     })
+    return data
   })
   .add('Using define property (getter)', function () {
     const data = {}
@@ -40,6 +44,7 @@ suite
       enumerable: true,
       configurable: true,
     })
+    return data
   })
 
 await suite.runAndPrintResults()

bench/array-creation.mjs

@@ -4,10 +4,10 @@ const suite = createBenchmarkSuite('Array Creation')
 
 suite
   .add('new Array', function () {
-    new Array(1024 * 1024)
+    return new Array(1024 * 1024)
   })
   .add('Array.from', function () {
-    Array.from({ length: 1024 * 1024 })
+    return Array.from({ length: 1024 * 1024 })
   })
 
 await suite.runAndPrintResults()

bench/blob.mjs

@@ -16,11 +16,11 @@ const blob1024 = new Blob(source1024)
 suite
   .add('new Blob (128)', function () {
     const result = new Blob(source128)
-    assert.ok(result)
+    return result
   })
   .add('new Blob (1024)', function () {
     const result = new Blob(source1024)
-    assert.ok(result)
+    return result
   })
   .add(
     'text (128)',
@@ -48,11 +48,11 @@ suite
   )
   .add('slice (0, 64)', function () {
     const blob = blob128.slice(0, 64)
-    assert.ok(blob)
+    return blob
   })
   .add('slice (0, 512)', function (deferred) {
     const blob = blob1024.slice(0, 512)
-    assert.ok(blob)
+    return blob
   })
 
 await suite.runAndPrintResults()

bench/compare-using-instanceof.mjs

@@ -8,36 +8,42 @@ suite
     if (err instanceof Error) {
       1 + 1
     }
+    return err
   })
   .add('[True conditional] Using constructor name', function () {
     const err = new Error()
     if (err.constructor.name === 'Error') {
       1 + 1
     }
+    return err
   })
   .add('[True conditional] Check if property is valid then instanceof ', function () {
     const err = new Error()
     if (err && err instanceof Error) {
       1 + 1
     }
+    return err
   })
   .add('[False conditional] Using instanceof only', function () {
     const err = undefined
     if (err instanceof Error) {
       1 + 1
     }
+    return err
   })
   .add('[False conditional] Using constructor name', function () {
     const err = undefined
     if (err?.constructor?.name === 'Error') {
       1 + 1
     }
+    return err
   })
   .add('[False conditional] Check if property is valid then instanceof ', function () {
     const err = undefined
     if (err && err instanceof Error) {
       1 + 1
     }
+    return err
   })
 
 await suite.runAndPrintResults()

bench/date-format.mjs

@@ -12,25 +12,25 @@ const df = new Intl.DateTimeFormat()
 
 suite
   .add('Intl.DateTimeFormat().format(Date.now())', function () {
-    new Intl.DateTimeFormat().format(Date.now())
+    return new Intl.DateTimeFormat().format(Date.now())
   })
   .add('Intl.DateTimeFormat().format(new Date())', function () {
-    new Intl.DateTimeFormat().format(new Date())
+    return new Intl.DateTimeFormat().format(new Date())
   })
   .add('Intl.DateTimeFormat(undefined, twoDigitsLocaleOptions).format(Date.now())', function () {
-    new Intl.DateTimeFormat(undefined, twoDigitsLocaleOptions).format(Date.now())
+    return new Intl.DateTimeFormat(undefined, twoDigitsLocaleOptions).format(Date.now())
   })
   .add('Intl.DateTimeFormat(undefined, twoDigitsLocaleOptions).format(new Date())', function () {
-    new Intl.DateTimeFormat(undefined, twoDigitsLocaleOptions).format(new Date())
+    return new Intl.DateTimeFormat(undefined, twoDigitsLocaleOptions).format(new Date())
   })
   .add('Reusing Intl.DateTimeFormat()', function () {
-    df.format(Date.now())
+    return df.format(Date.now())
   })
   .add('Date.toLocaleDateString()', function () {
-    new Date().toLocaleDateString()
+    return new Date().toLocaleDateString()
   })
   .add('Date.toLocaleDateString(undefined, twoDigitsLocaleOptions)', function () {
-    new Date().toLocaleDateString(undefined, twoDigitsLocaleOptions)
+    return new Date().toLocaleDateString(undefined, twoDigitsLocaleOptions)
   })
 
 await suite.runAndPrintResults()

bench/date-string-coersion.mjs

@@ -6,18 +6,22 @@ suite
   .add('Using String()', function () {
     const date = new Date()
     const value = String(date)
+    return value
   })
   .add('Using brackets {}', function () {
     const date = new Date()
     const value = `${date}`
+    return value
   })
   .add("Using '' + ", function () {
     const date = new Date()
     const value = '' + date
+    return value
   })
   .add('Using date.toString()', function () {
     const date = new Date()
     const value = date.toString()
+    return value
   })
 
 await suite.runAndPrintResults()

bench/deleting-properties.mjs

@@ -13,6 +13,7 @@ suite
     data.x
     data.y
     data.z
+    return data
   })
   .add('Using delete property (proto: null)', function () {
     const data = { __proto__: null, x: 1, y: 2, z: 3 }
@@ -21,6 +22,7 @@ suite
     data.x
     data.y
     data.z
+    return data
   })
   .add('Using delete property (cached proto: null)', function () {
     const data = new NullObject()
@@ -34,6 +36,7 @@ suite
     data.x
     data.y
     data.z
+    return data
   })
   .add('Using undefined assignment', function () {
     const data = { x: 1, y: 2, z: 3 }
@@ -42,6 +45,7 @@ suite
     data.x
     data.y
     data.z
+    return data
   })
   .add('Using undefined assignment (proto: null)', function () {
     const data = { __proto__: null, x: 1, y: 2, z: 3 }
@@ -50,6 +54,7 @@ suite
     data.x
     data.y
     data.z
+    return data
   })
   .add('Using undefined property (cached proto: null)', function () {
     const data = new NullObject()
@@ -63,6 +68,7 @@ suite
     data.x
     data.y
     data.z
+    return data
   })
 
 await suite.runAndPrintResults()

bench/error.mjs

@@ -4,13 +4,13 @@ const suite = createBenchmarkSuite('Node.js Error')
 
 suite
   .add('Error', function () {
-    new Error('test')
+    return new Error('test')
   })
   .add('NodeError', function () {
-    new TypeError('test')
+    return new TypeError('test')
   })
   .add('NodeError Range', function () {
-    new RangeError('test')
+    return new RangeError('test')
   })
 
 await suite.runAndPrintResults()

bench/function-return.mjs

@@ -6,42 +6,52 @@ suite
   .add('Function returning null', function () {
     const test = new Function('test', 'return null')
     const a = test()
+    return a
   })
   .add('Function returning explicitly undefined', function () {
     const test = new Function('test', 'return undefined')
     const a = test()
+    return a
   })
   .add('Function returning implicitly undefined', function () {
     const test = new Function('test', 'return')
     const a = test()
+    return a
   })
   .add('Function returning string', function () {
     const test = new Function('test', 'return "test"')
     const a = test()
+    return a
   })
   .add('Function returning integer', function () {
     const test = new Function('test', 'return 1')
     const a = test()
+    return a
   })
   .add('Function returning float', function () {
     const test = new Function('test', 'return 1.2')
     const a = test()
+    return a
   })
   .add('Function returning functions', function () {
     const test = new Function('test', 'return function() {}')
     const a = test()
+    return a
   })
   .add('Function returning arrow functions', function () {
     const test = new Function('test', 'return () => {}')
     const a = test()
+    return a
   })
   .add('Function returning empty object', function () {
     const test = new Function('test', 'return {}')
     const a = test()
+    return a
   })
   .add('Function returning empty array', function () {
     const test = new Function('test', 'return []')
     const a = test()
+    return a
   })
 
 await suite.runAndPrintResults()

bench/includes-vs-raw-comparison.mjs

@@ -6,18 +6,22 @@ suite
   .add('using Array.includes', function () {
     const httpVersion = '1.1'
     const exists = ['2.0', '1.0', '1.1'].includes(httpVersion)
+    return exists
   })
   .add('using Array.includes (first item)', function () {
     const httpVersion = '2.0'
     const exists = ['2.0', '1.0', '1.1'].includes(httpVersion)
+    return exists
   })
   .add('Using raw comparison', function () {
     const httpVersion = '1.1'
     const exists = httpVersion === '2.0' || httpVersion === '1.0' || httpVersion === '1.1'
+    return exists
   })
   .add('Using raw comparison (first item)', function () {
     const httpVersion = '2.0'
     const exists = httpVersion === '2.0' || httpVersion === '1.0' || httpVersion === '1.1'
+    return exists
   })
 
 await suite.runAndPrintResults()

bench/keys-vs-getownpropertynames.mjs

@@ -10,6 +10,7 @@ suite
       c: false,
     }
     const keys = Object.keys(object)
+    return keys
   })
   .add('Using Object.getOwnPropertyNames()', function () {
     const object = {
@@ -18,6 +19,7 @@ suite
       c: false,
     }
     const keys = Object.getOwnPropertyNames(object)
+    return keys
   })
 
 await suite.runAndPrintResults()

bench/last-array-item.mjs

@@ -8,22 +8,22 @@ const arr100_000_0 = Array.from({ length: 1000000 }, () => Math.floor(Math.rando
 
 suite
   .add('Length = 100 - Array.at', function () {
-    arr100.at(-1)
+    return arr100.at(-1)
   })
   .add('Length = 10_000 - Array.at', function () {
-    arr10_000.at(-1)
+    return arr10_000.at(-1)
   })
   .add('Length = 1_000_000 - Array.at', function () {
-    arr100_000_0.at(-1)
+    return arr100_000_0.at(-1)
   })
   .add('Length = 100 - Array[length - 1]', function () {
-    arr100[arr100.length - 1]
+    return arr100[arr100.length - 1]
   })
   .add('Length = 10_000 - Array[length - 1]', function () {
-    arr10_000[arr10_000.length - 1]
+    return arr10_000[arr10_000.length - 1]
   })
   .add('Length = 1_000_000 - Array[length - 1]', function () {
-    arr100_000_0[arr100_000_0.length - 1]
+    return arr100_000_0[arr100_000_0.length - 1]
   })
 
 await suite.runAndPrintResults()

bench/object-creation.mjs

@@ -7,22 +7,22 @@ Empty.prototype = Object.create(null)
 
 suite
   .add('Object.create(null)', function () {
-    Object.create(null)
+    return Object.create(null)
   })
   .add('Object.create({})', function () {
-    Object.create({})
+    return Object.create({})
   })
   .add('Cached Empty.prototype', function () {
-    new Empty()
+    return new Empty()
   })
   .add('Empty.prototype', function () {
     function NE() {}
     NE.prototype = Object.create(null)
-    new NE()
+    return new NE()
   })
   .add('Empty class', function () {
     function C() {}
-    new C()
+    return new C()
   })
 
 await suite.runAndPrintResults()