Add calculatePercentileFromRank helper function #2423
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Why: With raw rank storage, clients need to calculate percentile on-demand. Add helper function using formula: (rank / (totalCount - 1)) * 100 This enables flexible client-side transformations like: - Percentile display: "Top 15%" - Rank display: "Rank #42 of 280" - Percentage: "You're in the 85th percentile" Changes: - Added calculatePercentileFromRank(rank, totalCount) function - Returns percentile 0-100 (100 = highest balance) - Handles edge case: totalCount <= 1 returns 50 Pattern from: apps/distributor/src/weights.ts lines 134, 147 (original percentile calculation: const percentile = n > 1 ? (rank / (n - 1)) * 100 : 50) Test plan: - Unit test: calculatePercentileFromRank(0, 100) returns 0 - Unit test: calculatePercentileFromRank(99, 100) returns 100 - Unit test: calculatePercentileFromRank(50, 101) returns 50 - Edge case: calculatePercentileFromRank(0, 1) returns 50
Add comprehensive test coverage for the calculatePercentileFromRank helper function that calculates client-side percentiles from raw rank values. Tests cover: - Edge cases (single user, zero count) - Boundary values (rank 0, rank max) - Middle values for validation - Large totalCount values - Formula verification against migration comment All 12 tests passing. Pattern from: packages/app/utils/fixed-pool-calculation.test.ts (vitest test structure and assertion patterns) Co-Authored-By: Warp <agent@warp.dev>
This was referenced Dec 30, 2025
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Add calculatePercentileFromRank helper function
Why:
With raw rank storage, clients need to calculate percentile on-demand.
Add helper function using formula: (rank / (totalCount - 1)) * 100
This enables flexible client-side transformations like:
Changes:
Pattern from: apps/distributor/src/weights.ts lines 134, 147
(original percentile calculation: const percentile = n > 1 ? (rank / (n - 1)) * 100 : 50)
Test plan:
test: Add unit tests for calculatePercentileFromRank
Add comprehensive test coverage for the calculatePercentileFromRank helper
function that calculates client-side percentiles from raw rank values.
Tests cover:
All 12 tests passing.
Pattern from: packages/app/utils/fixed-pool-calculation.test.ts
(vitest test structure and assertion patterns)
Co-Authored-By: Warp agent@warp.dev