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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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4
packages/compiler/test/output/ts_emitter_spec.ts
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@ -10,6 +10,8 @@ import {StaticSymbol} from '@angular/compiler/src/aot/static_symbol';
import * as o from '@angular/compiler/src/output/output_ast';
import {TypeScriptEmitter} from '@angular/compiler/src/output/ts_emitter';
import {ParseLocation, ParseSourceFile, ParseSourceSpan} from '@angular/compiler/src/parse_util';
import {newArray} from '@angular/compiler/src/util';
import {stripSourceMapAndNewLine} from './abstract_emitter_spec';
const someGenFilePath = 'somePackage/someGenFile';
@ -160,7 +162,7 @@ const externalModuleIdentifier = new o.ExternalReference(anotherModuleUrl, 'some
});
it('should break expressions into multiple lines if they are too long', () => {
const values: o.Expression[] = new Array(100);
const values: o.Expression[] = newArray(100);
values.fill(o.literal(1));
values.splice(50, 0, o.fn([], [new o.ReturnStatement(o.literal(1))]));
expect(emitStmt(o.variable('fn').callFn(values).toStmt())).toEqual([