• Java: &, | also have the logical function. But it differents with &&, || which have short circuiting function.
• javascript special operator
  • instanceof: Test object class
  • in: Test whether property exists, prop in objectName
  • in object: test property whether in object
  • ** in array**: test index (not element) whether in array ~~~ var testInArray = [7, 8, 9]; "0" in testInArray; // true 1 in testInArray; // true "7" in testInArray; // false 8 in testInArray; // false ~~~
  • delete: Remove a property
  • typeof: Determine type of operand
  • void: return undefined value
  • >>>: Shift right with zero extension
  • ===, !== : Test for strict equality/inequality, type and value should be tested.
  • !!x: get equality of boolean of x
• go
  • ++, --: only supports post increment/decrement

{% highlight java %} /*** java ***/ Int demoInt2 = demoInt1++ ++demoInt1

• x ==y, x != y // value equals or not
• x.equals(y) // same object {% endhighlight %}

{% highlight python %}

python

a**b == pow(a, b) (a//b, a%b) == (a//b, a%b) == divmod(a, b) x == y, x !=y # value equals or not, check eq x is y, x is not y # same object or not, check pointer x in y, x not in y abs(-5) == 5 True a = 2 ~a from struct import pack pack('b', -1) '\xff'

build-in function for sequence, dict

min(), max(), sum(), cmp() {% endhighlight %}

{% highlight go %} /*** go ***/ demoInt2 := demoInt1++ // syntax error ++demoInt1 //syntax error x := 2 x, ^x // 0010 -> 1101 -> (1101 -1) -> 1100 -> 1011 {% endhighlight %}