Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

(perf) avoid object.keys on hot path for performance - simplify #772

Merged
merged 2 commits into from
Jan 7, 2018
Merged

(perf) avoid object.keys on hot path for performance - simplify #772

Changes from all commits
Commits
Show all changes
2 commits
Select commit Hold shift + click to select a range
7a1f79f
removing symbol logic for performance
vigneshshanmugam Dec 28, 2017
eaa217a
remove object keys check to improve performance
vigneshshanmugam Jan 5, 2018
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
17 changes: 10 additions & 7 deletions packages/babel-plugin-minify-simplify/src/helpers.js
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -3,17 +3,20 @@
const VOID_0 = t => t.unaryExpression("void", t.numericLiteral(0), true);

// Types as Symbols - for comparing types
// init must be empty object -
// computing this involves checking object.keys() to be of length 0
// skipped otherwise
const types = {};
// This is a test key which is used to avoid Object.keys check
// Object.keys() check is really expensive
// https://gist.github.com/vigneshshanmugam/c766550ecd02292dcdfbf0bf013b9d3d
const testKey = "Expression";

const typeSymbols = t => {
// don't recompute
if (Object.keys(types).length < 1) {
t.TYPES.forEach(type => {
types[type] = Symbol.for(type);
});
if (types[testKey] !== undefined) {
Copy link
Member Author

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Yields around 300-400ms on average - Results -> https://gist.github.com/vigneshshanmugam/c766550ecd02292dcdfbf0bf013b9d3d

return types;
}
t.TYPES.forEach(type => {
types[type] = Symbol.for(type);
});
return types;
};

Expand Down