Initial data commit

Task/Fivenum/JavaScript/fivenum.js

@@ -0,0 +1,29 @@
+function median(arr) {
+  let mid = Math.floor(arr.length / 2);
+  return (arr.length % 2 == 0) ? (arr[mid-1] + arr[mid]) / 2 : arr[mid];
+}
+
+Array.prototype.fiveNums = function() {
+  this.sort(function(a, b) { return a - b} );
+  let mid = Math.floor(this.length / 2),
+      loQ = (this.length % 2 == 0) ? this.slice(0, mid) : this.slice(0, mid+1),
+      hiQ = this.slice(mid);
+  return [ this[0],
+           median(loQ),
+           median(this),
+           median(hiQ),
+           this[this.length-1] ];
+}
+
+// testing
+let test = [15, 6, 42, 41, 7, 36, 49, 40, 39, 47, 43];
+console.log( test.fiveNums() );
+
+test = [0, 0, 1, 2, 63, 61, 27, 13];
+console.log( test.fiveNums() );
+
+test = [ 0.14082834,  0.09748790,  1.73131507,  0.87636009, -1.95059594,
+         0.73438555, -0.03035726,  1.46675970, -0.74621349, -0.72588772,
+         0.63905160,  0.61501527, -0.98983780, -1.00447874, -0.62759469,
+         0.66206163,  1.04312009, -0.10305385,  0.75775634,  0.32566578];
+console.log( test.fiveNums() );