Syntax

<tr>
  <th>Difference</th>
  <td><code>age.subtract(beauty)</code></td>
  <td><code>age MINUS beauty</code></td>
  <td><code>age - beauty</code></td>
</tr>

<tr>
  <th>Intersect</th>
  <td><code>age.intersect(beauty)</code></td>
  <td><code>age INTERSECT beauty</code></td>
  <td><code>age &amp; beauty</code></td>
</tr>

<tr>
  <th>Nullary Date</th>
  <td><code>NSDate()</code></td>
  <td colspan="2"><code>now()</code></td>
</tr>

<tr>
  <th>Nullary Integer</th>
  <td>N.A.</td>
  <td colspan="2"><code>random()</code></td>
</tr>

<tr>
  <th>Subquery</th>
  <td><code>age.filter{ $0 &gt; 42 }</code></td>
  <td><code>SUBQUERY(age,</code><br/><code>$x,</code><br/><code>$x &gt; 42)</code></td>
  <td><code>subquery(age,</code><br/><code>iterator: x,</code><br/><code>predicate:</code><br/><code>x &gt; 42)</code></td>
</tr>

<tr>
  <th rowspan="2">Unary Integer</th>
  <td>N.A.</td>
  <td colspan="2"><code>randomn(age)</code></td>
</tr>
<tr>
  <td colspan="3"><code>~age</code></td>
</tr>

<tr>
  <th rowspan="8">Unary Number</th>
  <td colspan="3"><code>sqrt(age)</code></td>
</tr>
<tr>
  <td colspan="3"><code>log(age)</code></td>
</tr>
<tr>
  <td colspan="3"><code>ln(age)</code></td>
</tr>
<tr>
  <td colspan="3"><code>exp(age)</code></td>
</tr>
<tr>
  <td colspan="3"><code>floor(age)</code></td>
</tr>
<tr>
  <td><code>ceil(age)</code></td>
  <td><code>ceiling(age)</code></td>
  <td><code>ceil(age)</code></td>
</tr>
<tr>
  <td colspan="3"><code>abs(age)</code></td>
</tr>
<tr>
  <td colspan="3"><code>trunc(age)</code></td>
</tr>

<tr>
  <th rowspan="8">Unary Sequence to Number</th>
  <td><code>age.reduce(0,</code><br/><code>combine:+)</code></td>
  <td colspan="2"><code>sum(age)</code></td>
</tr>
<tr>
  <td><code>age.count</code></td>
  <td colspan="2"><code>count(age)</code></td>
</tr>
<tr>
  <td><code>age.minElement()</code></td>
  <td colspan="2">min(age)</code></td>
</tr>
<tr>
  <td><code>age.maxElement()</code></td>
  <td colspan="2"><code>max(age)</code></td>
</tr>
<tr>
  <td>N.A.</td>
  <td colspan="2"><code>average(age)</code></td>
</tr>   
<tr>
  <td>N.A.</td>
  <td colspan="2"><code>median(age)</code></td>
</tr>
<tr>
  <td>N.A.</td>
  <td colspan="2"><code>mode(age)</code></td>
</tr>
<tr>
  <td>N.A.</td>
  <td colspan="2"><code>stddev(age)</code></td>
</tr>

<tr>
  <th rowspan="2">Unary String</th>
  <td><code>age.lowercaseString</code></td>
  <td colspan="2">lowercase(age)</code></td>
</tr>
<tr>
  <td><code>age.uppercaseString</code></td>
  <td colspan="2"><code>uppercase(age)</code></td>
</tr>

<tr>
  <th>Unary String to Integer</th>
  <td><code>age.length</code></td>
  <td colspan="2"><code>length(age)</code></td>
</tr>

<tr>
  <th>Union</th>
  <td><code>age.union(beauty)</code></td>
  <td><code>age UNION beauty</code></td>
  <td><code>age | beauty</code></td>
</tr>

<tr>
  <th>And</th>
  <td><code>age &gt; 21</code><br/><code>&amp;&amp; age &lt; 42</code></td>
  <td><code>age &gt; 21</code><br/><code>AND age &lt; 42</code></td>
  <td><code>age &gt; 21</code><br/><code>&amp;&amp; age &lt; 42</code></td>
</tr>

<tr>
  <th rowspan="6">Comparison</th>
  <td colspan="3"><code>age &lt; 42</code></td>
</tr>
<tr>
  <td colspan="3"><code>age &lt;= 42</code></td>
</tr>
<tr>
  <td colspan="3"><code>age &gt; 42</code></td>
</tr>
<tr>
  <td colspan="3"><code>age &gt;= 42</code></td>
</tr>
<tr>
  <td colspan="3"><code>age == 42</code></td>
</tr>
<tr>
  <td colspan="3"><code>age != 42</code></td>
</tr>

<tr>
  <th>Not</th>
  <td colspan="3"><code>!(age &gt; 42)</code></td>
</tr>


<tr>
  <th>Or</th>
  <td><code>age &gt; 21</code><br/><code>|| age &lt; 42</code></td>
  <td><code>age &gt; 21</code><br/><code>OR age &lt; 42</code></td>
  <td><code>age &gt; 21</code><br/><code>|| age &lt; 42</code></td>
</tr>

<tr>
  <th rowspan="2">Quantified</th>
  <td>N.A.</td>
  <td><code>ALL age == 42</code></td>
  <td><code>all(age == 42)</code></td>
</tr>

<tr>
  <td>N.A.</td>
  <td><code>ANY age == 42</code></td>
  <td><code>any(age == 42)</code></td>
</tr>

	Swift	NSPredicate	PredicatePal
Terms	N.A.	ANYKEY	AnyKey<T>
	N.A.		Block<T> { }
	true	TRUEPREDICATE	Boolean(true)
	false	FALSEPREDICATE	Boolean(false)
	42		Const(42)
	"hello"		Const("hello")
	self.age	age	Key<T>("age")
	self	SELF	This<T>()
	N.A.	$age	Var<T>("age")
Binary Index	age[1]
	age["one"]
Binary Integer	age & 42
	age | 42
	age ^ 42
	age << 42
	age >> 42
Binary Location to Number	age .distanceFromLocation (beauty)	distanceToLocation: fromLocation: (age, beauty)	distance(age, beauty)
Binary Number	age + 42
	age - 42
	age * 42
	age / 4
	age % 4	modulus:by:(age, 4)	age % 4
	pow(age, 4)	age ** 4

Missing expressions:

• Keypath-specified expressions: $age.n -- no compile-time support as of OS X 10.11 and iOS 9
• MATCHES, LIKE, BEGINSWITH, ENDWITH, IN, CONTAINS, BETWEEN -- need to pick suitable operator or function
• Predicate options: case insensitive, diacritic insensitive, normalised -- need to pick suitable implementation