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functionalprogramming/day184/funcday184/index.js

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+const R = require('ramda');
+
+const groupNames = (acc, {name}) => acc.concat(name)
+const toGrade = ({score}) =>
+  score < 65 ? 'F' :
+  score < 70 ? 'D' :
+  score < 80 ? 'C' :
+  score < 90 ? 'B' : 'A'
+
+var students = [
+  {name: 'Abby', score: 83},
+  {name: 'Bart', score: 62},
+  {name: 'Curt', score: 88},
+  {name: 'Dora', score: 92},
+]
+
+const rreduceby1 = reduceBy(groupNames, [], toGrade, students)
+//=> {"A": ["Dora"], "B": ["Abby", "Curt"], "F": ["Bart"]}
+
+console.log(rreduceby1);

functionalprogramming/day184/funcday184/package.json

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+{
+  "name": "funcday184",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC"
+}