Forword
The following javascript examples and notation demonstrate a few alternatives to well known methods for common tasks.
Advanced Notation
Tilde Operator
The tilde operator ~
literally equates to -(n+1)
. For example:
1 2 3 | var a = ~1; //returns -2 var myString = "hello world" ; ~myString.indexOf( "hello" ); //returns true |
Large Denary Numbers
Large denary numbers can be represented in short hand notation using the e
operator. For example:
1 | 1e6; //returns 1000000. |
Floor Checking
Math.floor is the traditional way to check for floor number values. There are two other short hand methods for performing the same operation, 0|
and ~~
. For example:
1 2 3 4 | var n = 1.23; Math.floor(n); //returns 1 ~~n; //returns 1 0|n; //returns 1 |
Infinity
When checking for infinity you can use Infinity
or you can use 1/0
. For example:
1 | Infinity == 1/0; //returns true; |
Comma Chaining
The ,
can be used to chain statements together. For example:
1 | with (document.body)style.backgroundColor= "#fff" ,style.color= "#000" |
Rounding
Another way to round numbers up is to use n+.5|0
which is the equivalent to Math.roun
d. However, this shortcut only works for positive numbers. For example:
1 2 | 3.2+0.5|0; //returns 3 3.5+0.5|0; //returns 4 |
String Linking
Strings have a built in method that will trans form them into a link and return the HTML. For example:
1 2 | //returns <a href="https://www.godlikemouse.com">godlikemouse</a> |
Bit Shifting
A quick way to divide by 2, or to raise something to the power of two is to shift the value. For example:
1 2 3 4 | 50>>1; //returns 25 20>>1; //returns 10 2<<1; //returns 4 8<<1; //returns 16 |
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