Add is-present helper

README.md

@@ -17,8 +17,9 @@ gte      | `if (a >= b)`                                 | `{{if (gte a b)}}`
 lt       | `if (a < b)`                                  | `{{if (lt a b)}}`       | No                              |
 lte      | `if (a <= b)`                                 | `{{if (lte a b)}}`      | No                              |
 is-array | `if (Ember.isArray(a))`                       | `{{if (is-array a)}}`   | Yes                             |
-is-empty | `if (Ember.isEmpty(a))`                       | `{{if (is-empty a)}}`   | No                             |
+is-empty | `if (Ember.isEmpty(a))`                       | `{{if (is-empty a)}}`   | No                              |
 is-equal | `if (Ember.isEqual(a, b))`                    | `{{if (is-equal a b)}}` | No                              |
+is-present | `if (Ember.isPresent(a))`                   | `{{if (is-present a)}}` | No                              |
 
 ### API
 

addon/helpers/is-present.js

@@ -0,0 +1,6 @@
+import { helper } from '@ember/component/helper';
+import { isPresent } from '@ember/utils';
+
+export default helper(function([obj]) {
+  return isPresent(obj)
+})

app/helpers/is-present.js

@@ -0,0 +1 @@
+export { default } from 'ember-truth-helpers/helpers/is-present';

tests/unit/helpers/is-present-test.js

@@ -0,0 +1,48 @@
+import { module, test } from 'qunit';
+import { setupRenderingTest } from 'ember-qunit';
+import { render } from '@ember/test-helpers';
+import hbs from 'htmlbars-inline-precompile';
+
+module('helper:is-present', function(hooks) {
+  setupRenderingTest(hooks);
+
+  test('undefined/null values', async function(assert) {
+    this.set('thisIsUndefined', undefined)
+    this.set('thisIsNull', null)
+    this.set('thisIsNotNull', new Date())
+    await render(hbs("[{{is-present thisIsUndefined}}] [{{is-present thisIsNull}}] [{{is-present thisIsNotNull}}]"));
+
+    assert.equal(this.$().text(), '[false] [false] [true]', 'value should be "[false] [false] [true]"');
+  });
+
+  test('boolean values', async function(assert) {
+    await render(hbs("[{{is-present true}}] [{{is-present false}}]"));
+
+    assert.equal(this.$().text(), '[true] [true]', 'value should be "[true] [true]"');
+  });
+
+  test('objects', async function(assert) {
+    this.set('presentObject', {})
+    this.set('notpresentObject', { some: 'object' })
+    await render(hbs("[{{is-present presentObject}}] [{{is-present notpresentObject}}]"));
+
+    assert.equal(this.$().text(), '[true] [true]', 'value should be "[true] [true]"');
+  });
+
+  test('arrays', async function(assert) {
+    this.set('presentArray', [])
+    this.set('notpresentArray', [ 'a', 8, {} ])
+    await render(hbs("[{{is-present presentArray}}] [{{is-present notpresentArray}}]"));
+
+    assert.equal(this.$().text(), '[false] [true]', 'value should be "[false] [true]"');
+  });
+
+  test('strings', async function(assert) {
+    this.set('presentString', '')
+    this.set('whitespaceString', '   ')
+    this.set('notpresentString', 'full of text')
+    await render(hbs("[{{is-present presentString}}] [{{is-present whitespaceString}}] [{{is-present notpresentString}}]"));
+
+    assert.equal(this.$().text(), '[false] [false] [true]', 'value should be "[false] [false] [true]"');
+  });
+});