Re-add precision Round

bayesimpact · May 14, 2018 · a7bfc7d · a7bfc7d
1 parent e31e9a5
commit a7bfc7d
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Showing 2 changed files with 11 additions and 2 deletions.
diff --git a/frontend/src/components/DownloadAnalysisLink/BuildCSV.ts b/frontend/src/components/DownloadAnalysisLink/BuildCSV.ts
@@ -8,11 +8,12 @@ import { averageMeasure, maxMeasure, minMeasure } from '../../utils/analytics'
 import { generateCSV } from '../../utils/csv'
 import { adequaciesFromServiceArea, representativePointsFromServiceAreas, summaryStatisticsByServiceArea } from '../../utils/data'
 import { parseSerializedServiceArea, safeDatasetHint } from '../../utils/formatters'
+import { precisionRound } from '../../utils/numbers'
 import { snakeCase } from '../../utils/string'
 
 const staticCsvRootUrl: string = CONFIG.staticAssets.rootUrl
 const staticCsvPath: string = CONFIG.staticAssets.csv.path
-
+const defaultPrecision: number = 2 // Default decimal precision for CSV.
 /**
  * Build an analysis CSV for download from the census data.
  */
@@ -81,7 +82,7 @@ function getDataForCensusCategories(demographics: any, populationByAnalytics: nu
   return flattenDeep(
     censusCategories.map(_ => {
       return CENSUS_MAPPING[_].map(group => {
-        return (populationByAnalytics.map(category => category * 0.01 * demographics[_][group] || 0))
+        return (populationByAnalytics.map(category => precisionRound(category * 0.01 * demographics[_][group] || 0, defaultPrecision)))
       })
     })
   )

diff --git a/frontend/src/utils/numbers.ts b/frontend/src/utils/numbers.ts
@@ -8,3 +8,11 @@ export function maybeParseFloat(string: string | null) {
   }
   return float
 }
+
+/**
+* Convenience function for rounding without using toFixed (which is for formatting).
+*/
+export function precisionRound(number: number, precision: number): number {
+  const factor = Math.pow(10, precision)
+  return Math.round(number * factor) / factor
+}