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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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12
packages/bazel/src/ng_package/packager.ts
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@ -335,7 +335,7 @@ function main(args: string[]): number {
const parts = packageName.split('/');
// Remove the scoped package part, like @angular if present
const nameParts = packageName.startsWith('@') ? parts.splice(1) : parts;
const relativePath = Array(nameParts.length - 1).fill('..').join('/') || '.';
const relativePath = newArray(nameParts.length - 1, '..').join('/') || '.';
let basename: string;
if (dir === 'bundles') {
basename = nameParts.join('-') + '.umd';
@ -435,3 +435,13 @@ export * from '${srcDirRelative(inputPath, typingsFile.replace(/\.d\.tsx?$/, '')
if (require.main === module) {
process.exitCode = main(process.argv.slice(2));
}
export function newArray<T = any>(size: number): T[];
export function newArray<T>(size: number, value: T): T[];
export function newArray<T>(size: number, value?: T): T[] {
const list: T[] = [];
for (let i = 0; i < size; i++) {
list.push(value !);
}
return list;
}