Import third party lib.

lib/utils.js

@@ -1,20 +1,74 @@
-const pythagoras = ( vector ) => {
+const underscore = require('../node_modules/underscore');
+
+
+/**
+ * vector norm
+ *
+ * @desc    compute the norm of vector with n components
+ * @param   {Array<Number>}     vector       - components of a vector
+ * @returns {Number}
+ */
+
+ const vectorNorm = ( vector ) => {
   const squareSum = vector
     .map( (component) => component*component)
     .reduce( (memo, square) => memo+square );
   return Math.sqrt(squareSum);
 }
 
 const triplets =  [
-  [3, 4],
-  [3, 4],
+  [3, 4, 5],
+  [5, 12, 13],
+  [8, 15, 17],
+  [7, 24, 25],
+  [20, 21, 29],
+  [12, 35, 37],
+  [9, 40, 41],
+  [28, 45, 53],
+  [11, 60, 61],
+  [16, 63, 65],
+  [33, 56, 65],
+  [48, 55, 73],
+  [13, 84, 85],
+  [36, 77, 85],
+  [39, 80, 89],
+  [65, 72, 97],
 ];
 
 
-/*
-(3, 4, 5)	(5, 12, 13)	(8, 15, 17)	(7, 24, 25)
-(20, 21, 29)	(12, 35, 37)	(9, 40, 41)	(28, 45, 53)
-(11, 60, 61)	(16, 63, 65)	(33, 56, 65)	(48, 55, 73)
-(13, 84, 85)	(36, 77, 85)	(39, 80, 89)	(65, 72, 97)
-*/
-console.log( pythagoras(triplets) );
+const Candidate =  function(name, birthDate) {
+  this.name = name,
+  this.birthDate = birthDate,
+  this.getAge = () => {
+    const dateDiff = new Date( Date.now() - new Date(this.birthDate) );
+    return Math.abs(dateDiff.getUTCFullYear() - 1970);
+  }
+};
+
+
+const Job =  function(startDate, endDate, jobDescription, company) {
+  this.startDate = startDate,
+  this.birthDate = endDate,
+  this.getDuration = () => {
+    const dateDiff = new Date( Date.now() - new Date(this.birthDate) );
+    return Math.abs(dateDiff.getUTCFullYear() - 1970);
+  }
+};
+
+
+// test pythagoras
+triplets.forEach ( (triplet) => {
+  console.log("solution : " +triplet[2]);
+  console.log( vectorNorm(triplet.slice(2) ));
+  console.log("_______________________");
+});
+
+// test candidate
+const candidate1 = new Candidate( "sebastian", "1980-10-12" );
+
+console.log( candidate1.getAge() );
+
+
+const Experiences =  ( (jobs) => {
+  return jobs;
+});

package.json

@@ -0,0 +1,5 @@
+{
+  "dependencies": {
+    "underscore": "*"
+  }
+}

yarn-error.log

@@ -0,0 +1,34 @@
+Arguments: 
+  /home/toma/.nvm/versions/node/v8.8.0/bin/node /home/toma/.yarn/bin/yarn.js install
+
+PATH: 
+  /home/toma/.yarn/bin:/home/toma/.yarn/bin:/home/toma/.nvm/versions/node/v8.8.0/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin
+
+Yarn version: 
+  1.3.2
+
+Node version: 
+  8.8.0
+
+Platform: 
+  linux x64
+
+npm manifest: 
+  "dependencies": {
+  	"underscore": "*"
+   }
+
+yarn manifest: 
+  No manifest
+
+Lockfile: 
+  No lockfile
+
+Trace: 
+  SyntaxError: /opt/lampp/htdocs/filtering/package.json: Unexpected token : in JSON at position 14
+      at JSON.parse (<anonymous>)
+      at /home/toma/.yarn/lib/cli.js:770:59
+      at Generator.next (<anonymous>)
+      at step (/home/toma/.yarn/lib/cli.js:92:30)
+      at /home/toma/.yarn/lib/cli.js:103:13
+      at <anonymous>

yarn.lock

@@ -0,0 +1,7 @@
+# THIS IS AN AUTOGENERATED FILE. DO NOT EDIT THIS FILE DIRECTLY.
+# yarn lockfile v1
+
+
+underscore@*:
+  version "1.8.3"
+  resolved "https://registry.yarnpkg.com/underscore/-/underscore-1.8.3.tgz#4f3fb53b106e6097fcf9cb4109f2a5e9bdfa5022"