Identify and eliminate computations that are performed repeatedly when they could be executed once. This includes moving loop-invariant checks outside of loops and reducing callback overhead that creates unnecessary function declarations.
Common patterns to optimize:
Example from file upload validation:
// Before: checking upload limit for every file
filesArray.some(file => {
// ... file-specific checks ...
|| (files.length + media.size + pending > maxMediaAttachments) // This doesn't depend on individual file!
})
// After: check upload limit once before processing files
if (files.length + media.size + pending > maxMediaAttachments) {
// handle error
return;
}
// Then process individual files without redundant check
This optimization reduces computational overhead and improves performance, especially in scenarios with loops, callbacks, or frequently called functions.
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