Expression Evaluation
Our ducks can recognize mathematical, logical, and conditional expressions if you've programmed in another language before you will probably understand most of what this means.
Standard Evaluations
Data Types
A string is a type of data that contains one or multiple characters in a sequence which, as with other languages, our ducks most commonly recognize wrapped in quotation marks.
"Hello World"
A number is the same to our ducks as it is to you, that being a type of data that can contain most numbers.
100
A boolean is to our ducks similar in nature to a light switch in that it contains a TRUE or FALSE. Do not our ducks only seem to understand these words when they are in all caps.
TRUE
FALSE
Mathematics
While doing the math the ducks of DucklingScript use the rules of PEMDAS including the typical behaviors of the rule evaluating left to right but prioritizing multiplication and division above addition and subtraction and treating multiplication, division, floor division, and modulus, all with the same priority.
Here are some notes from our swimming scientist about all the operators the ducks in DucklingScript are trained to recognize:
Exponents
10^2
Result is 100
Addition/subtraction
5+5
5-5
Result is 10, and 0
Multiplication/Division
5*5
5/5
Result is 25, and 1
Floor Division
3//2
Result is 1 (the decimal is essentially truncated, meaning removed)
Modulus
5%2
Result is 1 (when dividing 5 by 2, there is a remainder of 1)
Along with typical expressions, our ducks can also add strings together both with themselves and other data types, we refer to this as "concatenation" which you can see below:
"Mother duck layed " + 5 + " eggs."
Result is Mother duck layed 5 eggs..
Conditionals
When looking at conditions our ducks always return either TRUE or FALSE (like a boolean). Any conditions are considered after any mathematical statements are completed, or "evaluated" if you prefer, and all have the same priority, with our ducks reading them left to right as usual.
Equal to
10==10
5==2
Results are TRUE, and FALSE.
Not equal to
10!=10
5!=2
Results are FALSE, and TRUE.
Greater than
5>2
10>10
Results are TRUE, and FALSE.
Lesser than
5<2
10<10
Both result in FALSE.
Greater than or equal to
5>=2
10>=10
Both result in TRUE.
Lesser than or equal to
5<=2
10<=10
Results are FALSE, and TRUE.
Not
!(FALSE)
!(5!=2)
!TRUE
The results are TRUE, FALSE, and an error.
Our ducks are generally confused about the NOT operator, so you'll need to use parenthesis for them to understand it correctly like so: !(FALSE).