feat: multi concat (#236)

Author: juliachen-arcticleaf

helpers.js

@@ -36,6 +36,7 @@ const helpersList = [
     'limit',
     'moment',
     'money',
+    'multiConcat',
     'nl2br',
     'occurrences',
     'option',

helpers/multiConcat.js

@@ -0,0 +1,24 @@
+'use strict';
+
+/**
+ * Concats multi values, primarily used as a subhelper
+ * @example
+ *  {{multiConcat "string1" "string2" "string3"}}
+ */
+
+
+const factory = globals => {
+    return function(...args) {
+        // Take the last arg which is a Handlebars options object out of args array
+        args.pop();
+
+        return args.join('');
+    };
+
+};
+
+
+module.exports = [{
+    name: 'multiConcat',
+    factory: factory,
+}];

spec/helpers.js

@@ -54,6 +54,7 @@ describe('helper registration', () => {
             'limit',
             'moment',
             'money',
+            'multiConcat',
             'nl2br',
             'occurrences',
             'option',

spec/helpers/multiConcat.js

@@ -0,0 +1,55 @@
+const Lab = require('lab'),
+      lab = exports.lab = Lab.script(),
+      describe = lab.experiment,
+      it = lab.it,
+      testRunner = require('../spec-helpers').testRunner;
+
+
+describe('multiConcat helper', function() {
+    const context = {
+        string1: "First",
+        string2: "Second",
+        string3: "Third",
+        string4: "Fourth"
+    };
+
+    const runTestCases = testRunner({context});
+
+    it('should concatenate all strings by default', function(done) {
+        runTestCases([
+            {
+                input: '{{multiConcat string1 string2 string3}}',
+                output: 'FirstSecondThird',
+            },
+            {
+                input: '{{multiConcat string1 string2 string3 string4}}',
+                output: 'FirstSecondThirdFourth',
+            },
+            {
+                input: '{{multiConcat string1 string2}}',
+                output: 'FirstSecond',
+            }
+        ], done);
+    });
+
+    it('should accept string, number, boolean, empty', function(done) {
+        runTestCases([
+            {
+                input: '{{multiConcat "First" 2}}',
+                output: 'First2',
+            },
+            {
+                input: '{{multiConcat string1 3 "" "4" true}}',
+                output: 'First34true',
+            },
+            {
+                input: '{{multiConcat string1 3 false "" "4" true}}',
+                output: 'First3false4true',
+            },
+            {
+                input: '{{multiConcat string1 ""}}',
+                output: 'First',
+            }
+        ], done);
+    });
+});