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functionalprogramming/day186/funcday186/index.js

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+const R = require('ramda');
+
+const rreduceRight1 = R.reduceRight(R.subtract, 0, [1, 2, 3, 4]) // => (1 - (2 - (3 - (4 - 0)))) = -2
+
+console.log(rreduceRight1);
+//    -               -2
+//   / \              / \
+//  1   -            1   3
+//     / \              / \
+//    2   -     ==>    2  -1
+//       / \              / \
+//      3   -            3   4
+//         / \              / \
+//        4   0            4   0
+

functionalprogramming/day186/funcday186/package.json

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+{
+  "name": "funcday186",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC"
+}