feat add not contains operator

Author: sainis-p

README.md

@@ -82,7 +82,7 @@ q.or(filters); //returns an array of all objects in `arr` that satisfy SOME of t
 
 *`value`* - The value of the property we will filter on
 
-*`operator`* - The filter operator. Supported operators `equals`, `contains`, `gt`, `gte`, `lt`, `lte`, `ne`
+*`operator`* - The filter operator. Supported operators `equals`, `contains`, `notcontains`, `gt`, `gte`, `lt`, `lte`, `ne`
 
 *`matchMissing`* - If `true` the filter will be satisfied even if `field` property is not present on the object. Default is `false`.
 

lib/operators.js

@@ -5,6 +5,13 @@ const contains = (val1, val2) => {
   return val1.indexOf(val2) > -1;
 };
 
+const notcontains = (val1, val2) => {
+  if (!Array.isArray(val1)) {
+    throw new Error('`val1` must be an array');
+  }
+  return val1.indexOf(val2) < 0;
+};
+
 const equals = (val1, val2) => val1 === val2;
 const ne = (val1, val2) => val1 !== val2;
 const gt = (val1, val2) => val1 > val2;
@@ -14,6 +21,7 @@ const lte = (val1, val2) => val1 <= val2;
 
 module.exports = {
   contains,
+  notcontains,
   equals,
   ne,
   gt,

package.json

@@ -1,6 +1,6 @@
 {
   "name": "query-objects",
-  "version": "0.0.4",
+  "version": "0.0.5",
   "description": "A utility library which filters objects from an array of objects based on a set of filter conditions",
   "main": "index.js",
   "scripts": {

test/lib/operators.spec.js

@@ -1,5 +1,6 @@
 const should = require('chai').Should();
 const contains = require('../../lib/operators').contains;
+const notcontains = require('../../lib/operators').notcontains;
 const equals = require('../../lib/operators').equals;
 const ne = require('../../lib/operators').ne;
 const gt = require('../../lib/operators').gt;
@@ -20,6 +21,17 @@ describe('Operators module tests', () => {
 
   });
 
+  it('notcontains(val1, val2) should return true `val1` notcontains `val2` otherwise false', () => {
+    const val1 = [1, 2, 3];
+    notcontains(val1, 1).should.be.false;
+    notcontains(val1, 10).should.be.true;
+
+    (() => {
+      notcontains('', 10);
+    }).should.throw('`val1` must be an array');
+
+  });
+
   it('equals(val1, val2) should return true `val1` equals `val2` otherwise false', () => {
     equals(1, 1).should.be.true;
     equals(1, 10).should.be.false;