client side data models

shared/utils/array.js

@@ -0,0 +1,30 @@
+class ArrayUtil {
+
+  static diff(a1, a2){
+    a1.filter((a1n)=>{ return a2.indexOf(a1n) < 0; });
+  }
+
+  static selectMap(a, fnSelect, fnMap){
+    var map = [];
+    for (var elem of a){
+      if (fnSelect(elem)){
+        map.push(fnMap(elem));
+      }
+    }
+    return map;
+  }
+
+  static all(a, fnCondition){
+    var all = true;
+    for (var elem of a){
+      if (!fnCondition(elem)){
+        all = false;
+        break;
+      }
+    }
+    return all;
+  }
+
+}
+
+export default ArrayUtil;

shared/utils/math.js

@@ -7,4 +7,26 @@ export default class {
   static n6(){
     return ((Math.random() + Math.random() + Math.random() + Math.random() + Math.random() + Math.random()) - 3) / 3;
   }
+
+  // min_max1 and min_max2 arrays of length two representing mins and maxes of their ranges;
+  // returns array of array length two, representing mins and maxes not within min_max2.
+  static minusRange(min_max1, min_max2){
+    var minus = [];
+    if (min_max1[0] >= min_max2[0]){
+      if (min_max1[1] > min_max2[1]) minus.push([min_max2[1], min_max1[1]]);
+    } else if (min_max1[1] <= min_max2[1]){
+      if (min_max1[0] < min_max2[0]) minus.push([min_max1[0], min_max2[0]]);
+    } else if (min_max1[0] < min_max2[0] && min_max1[1] > min_max2[1]){
+      minus.push([min_max1[0], min_max2[0]]);
+      minus.push([min_max2[1], min_max1[1]]);
+    } else {
+      minus.push([min_max1[0], min_max1[1]]);
+    }
+    return minus;
+  }
+
+  static inRange(n, min_max){
+    return n >= min_max[0] && n =< min_max[1];
+  }
+
 }