chance-generators - npm Package Compare versions

Comparing version 2.3.0 to 2.4.0

lib/chance-generators.js

@@ -120,3 +120,16 @@ /*global define*/
       unique: function (generator, count, options) {
-        return createGenerator('unique', [generator, count], [generator])
+        var uniqueGenerator = generatorFunction('unique', [generator, count], function () {
+          const comparator = options && options.comparator
+          return comparator
+            ? chance.unique(() => generator(), unwrap(count), { comparator: comparator })
+            : chance.unique(generator, unwrap(count))
+        })
+
+        installMapFunction(uniqueGenerator)
+
+        uniqueGenerator.shrink = function (data) {
+          return shrinkers.unique(uniqueGenerator, data)
+        }
+
+        return uniqueGenerator
       }
@@ -231,5 +244,11 @@ }
 
-        var dataGenerator = generator.args[0]
+        var minCount = 0
 
-        return that.unique(dataGenerator, count)
+        if (typeof count === 'number') {
+          minCount = count
+        } else if (count && count.isGenerator && count.args[0] && count.args[0].min) {
+          minCount = count.args[0].min
+        }
+
+        return that.arraySplicer(data, { min: minCount })
       },
@@ -236,0 +255,0 @@ shape: function (generator, data) {

package.json

 {
   "name": "chance-generators",
-  "version": "2.3.0",
+  "version": "2.4.0",
   "description": "Random generators based on changejs",
@@ -5,0 +5,0 @@ "main": "lib/chance-generators.js",

test/chance-generators.spec.js

@@ -508,2 +508,13 @@ /*global describe, it*/
     describe('given a generator and a number', () => {
+      it('generates arrays with unique values from that generator', () => {
+        const arr = [42, 13, 666, 3.14]
+        const generator = chance.unique(chance.pick(arr), 2)
+        expect([generator(), generator(), generator(), generator()], 'to satisfy', [
+          [ 13, 3.14 ],
+          [ 3.14, 42 ],
+          [ 666, 3.14 ],
+          [ 666, 42 ]
+        ])
+      })
+
       it('returns a new generator that returns the specified number of unique items generated by the given generator', () => {
@@ -518,3 +529,36 @@ const arr = [42, 'foo', { wat: 'taw' }]
 
+    describe('when given a comparator function', () => {
+      it('uses the comparator function to decide if items are equal', () => {
+        const persons = chance.pickone([
+          'Sune', 'Andreas', 'Gustav', 'Alex', 'Peter',
+          'Sune', 'Andreas', 'Gustav', 'Alex', 'Peter',
+          'Sune', 'Andreas', 'Gustav', 'Alex', 'Peter',
+          'Sune', 'Andreas', 'Gustav', 'Alex', 'Peter',
+          'Sune', 'Andreas', 'Gustav', 'Alex', 'Peter'
+        ].map(name => ({ name })))
+
+        expect(chance.unique(persons, 5, {
+          comparator: (arr, person) => arr.some(p => p.name === person.name)
+        }), 'when called', 'to satisfy', [
+          { name: 'Peter' },
+          { name: 'Alex' },
+          { name: 'Andreas' },
+          { name: 'Gustav' },
+          { name: 'Sune' }
+        ])
+      })
+    })
+
     describe('shrink', () => {
+      it('generates smaller sub-sets of the given data', () => {
+        const generator = chance.unique(chance.state, chance.natural({ max: 10 }))
+
+        const shrunkenGenerator = generator.shrink(['SC', 'WV', 'FL'])
+        expect([shrunkenGenerator(), shrunkenGenerator(), shrunkenGenerator()], 'to satisfy', [
+          ['SC'],
+          ['SC', 'WV', 'FL'],
+          ['SC', 'WV']
+        ])
+      })
+
       it('returns a new generator generating smaller unique sets', () => {
@@ -521,0 +565,0 @@ let generator = chance.unique(chance.state, chance.natural({ max: 10 }))

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Improved metrics

Total package byte prevSize

48325

increased by4.91%

Lines of code

1048

increased by5.43%

No dependency changes