Add Array.fill to array append benchmarks

bench/array-append.js

@@ -1,68 +1,99 @@
 const { H2, createTableHeader } = require('../markdown')
 
-function compareToMdTable(name, amount, ms) {
+function compareToMdTable (name, amount, ms) {
   const numberFormat = new Intl.NumberFormat()
   return `${name}|${numberFormat.format(amount)}|${numberFormat.format(ms)}ms`
 }
 
-function compare(total) {
-  const arrayPush = performance.now();
-  var array = [];
-  for (var i = 0; i < total; i++) {
-    array.push(i);
-  }
-  const arrayPushTotal = performance.now() - arrayPush;
-
-  const preAlloc = performance.now();
-  var array2 = new Array(total);
-  for (var i = 0; i < total; i++) {
-    array2[i] = i;
-  }
-  const preAllocToal = performance.now() - preAlloc;
-
-  console.log(compareToMdTable('array.push', total, arrayPushTotal))
-  console.log(compareToMdTable('new Array(length)', total, preAllocToal))
+const bench = (name, total, fn) => {
+  const start = performance.now()
+  fn()
+  const diff = performance.now() - start
+  console.log(compareToMdTable(name, total, diff))
 }
 
-function compareStrings(total) {
-  const arrayPush = performance.now();
-  var array = [];
-  for (var i = 0; i < total; i++) {
-    array.push('test');
-  }
-  const arrayPushTotal = performance.now() - arrayPush;
-
-  const preAlloc = performance.now();
-  var array2 = new Array(total);
-  for (var i = 0; i < total; i++) {
-    array2[i] = 'test'
-  }
-  const preAllocToal = performance.now() - preAlloc;
-
-  console.log(compareToMdTable('array.push', total, arrayPushTotal))
-  console.log(compareToMdTable('new Array(length)', total, preAllocToal))
+function compare (total) {
+  console.log(tableHeader)
+
+  bench('new Array(length) + fill(a,b,c) DESC', total, () => {
+    const array = new Array(total)
+    for (let i = total; i-- > 0;) array.fill(i, i, i+1)
+  })
+
+  bench('array.push', total, () => {
+    const array = []
+    for (let i = 0; i < total; i++) array.push(i)
+  })
+
+  bench('new Array(length) + array[i] = i', total, () => {
+    const array = new Array(total)
+    for (let i = 0; i < total; i++) array[i] = i
+  })
+
+  bench('fixed size fill(a,b,c)', total, () => {
+    const array = new Array(total)
+    for (let i = 0; i < total; i++) array.fill(i, i, i+1)
+  })
+
+  bench('array[i] = i', total, () => {
+    const array = []
+    for (let i = 0; i < total; i++) array[i] = i
+  })
+
+  bench('fixedArray[i] = i DESC', total, () => {
+    const array = new Array(total)
+    for (let i = total; i-- > 0;) array[i] = i
+  })
+
+  bench('variableArray[i] = i DESC', total, () => {
+    const array = []
+    for (let i = total; i-- > 0;) array[i] = i
+  })
+
+}
+
+function compareStrings (total) {
+  console.log(tableHeader)
+
+  bench('Array.fill(a,b,c)', total, () => {
+    const array = Array.from(total)
+    for (let i = 0; i < total; i++) array.fill('test', i, i + 1)
+  })
+
+  bench('array.push', total, () => {
+    const array = []
+    for (let i = 0; i < total; i++) array.push('test')
+  })
+
+  bench('array[i] = string', total, () => {
+    const array = new Array(total)
+    for (let i = 0; i < total; i++) array[i] = 'test'
+  })
+
+  bench('Array.from', total, () => {
+    const array = Array.from({ length: total }, () => 'test')
+  })
+
+  bench('Array.fill', total, () => {
+    const array = Array.from(total).fill('test')
+  })
+
+  console.log()
 }
 
 console.log(H2('Array.append (number)'))
 const tableHeader = createTableHeader([
   'type',
   'amount',
-  'time elapsed',
+  'time elapsed'
 ])
 
-console.log(tableHeader)
-compare(10);
-compare(100);
-compare(1000);
-compare(10000);
-compare(1000000);
-compare(100000000);
+for (let i = 6; i <= 8; i++) {
+  compare(10 ** i)
+}
 
 console.log(H2('Array.append (string)'))
-console.log(tableHeader)
-compareStrings(10);
-compareStrings(100);
-compareStrings(1000);
-compareStrings(10000);
-compareStrings(1000000);
-compareStrings(100000000);
+// console.log(tableHeader)
+for (let i = 6; i <= 8; i++) {
+  compareStrings(10 ** i)
+}