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perf: don't create holey arrays (#32155)

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Don't use `Array` constructor with the size value (ex. `new Array(5)`) - this will create a `HOLEY_ELEMENTS` array (even if this array is filled in later on!);

https://v8.dev/blog/elements-kinds
https://stackoverflow.com/questions/32054170/how-to-resize-an-array

PR Close #32155
This commit is contained in:
Miško Hevery
2019-08-15 13:42:17 -07:00
committed by Andrew Kushnir
parent c957dfc167
commit 64770571b2
32 changed files with 137 additions and 83 deletions
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5
packages/compiler/test/output/output_jit_spec.ts
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@ -10,6 +10,7 @@ import {EmitterVisitorContext} from '@angular/compiler/src/output/abstract_emitt
import * as o from '@angular/compiler/src/output/output_ast';
import {JitEmitterVisitor, JitEvaluator} from '@angular/compiler/src/output/output_jit';
import {R3JitReflector} from '@angular/compiler/src/render3/r3_jit';
import {newArray} from '@angular/compiler/src/util';
import {JitReflector} from '@angular/platform-browser-dynamic/src/compiler_reflector';
const anotherModuleUrl = 'somePackage/someOtherPath';
@ -18,10 +19,10 @@ const anotherModuleUrl = 'somePackage/someOtherPath';
describe('Output JIT', () => {
describe('regression', () => {
it('should generate unique argument names', () => {
const externalIds = new Array(10).fill(1).map(
const externalIds = newArray(10, 1).map(
(_, index) =>
new o.ExternalReference(anotherModuleUrl, `id_${index}_`, {name: `id_${index}_`}));
const externalIds1 = new Array(10).fill(1).map(
const externalIds1 = newArray(10, 1).map(
(_, index) => new o.ExternalReference(
anotherModuleUrl, `id_${index}_1`, {name: `id_${index}_1`}));
const ctx = EmitterVisitorContext.createRoot();