Early Length Check for Array Comparisons

When comparing arrays with expensive operations (sorting, deep equality, serialization), check lengths first. If lengths differ, the arrays cannot be equal. In real-world applications, this optimization is especially valuable when the comparison runs in hot paths (event handlers, render loops).

javascriptarraysperformanceoptimizationcomparison

Code Comparison

•Incorrect (always runs expensive comparison):typescript

•Correct (O(1) length check first):typescript

Why This Matters

Impact: avoids expensive operations when lengths differ. This optimization is classified as MEDIUM-HIGH priority for production applications.

Build Index Maps for Repeated Lookups

Use Loop for Min/Max Instead of Sort

Use←→to navigate