ChardScript Booleans

Booleans represent one of two values: true or false.

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Boolean Values

In programming you often need to know if an expression is true or false.

You can evaluate any expression in ChardScript, and get one of two answers, 1 or 0, 1 is true and 0 is false.

When you compare two values, the expression is evaluated and ChardScript returns the Boolean answer:

Example

echo(10 > 9)
echo(10 == 9)
echo(10 < 9)

When you run a condition in an if statement, ChardScript returns true or false:

Example

Print a message based on whether the condition is true or false:

call a = 200
call b = 33

if b > a then
  echo("b is greater than a")
else
  echo("b is not greater than a")
end

Functions can Return a Boolean

You can create functions that returns a Boolean Value:

Example

Print the answer of a function:

group myFunction()
  give true
end

echo(myFunction())

You can execute code based on the Boolean answer of a function:

Example

Print "YES!" if the function returns true, otherwise print "NO!":

group myFunction()
  give true

if myFunction() then
  print("YES!")
else
  print("NO!")
end

ChardScript also has many built-in functions that return a boolean value, likeisnumber(), isstring(),islist()andisgroup()functions.

Example

Check if an object is an number or not:

call x = 200
echo(isnumber(x))

Example

Check if an object is an string or not:

call x = "Hello World!"
echo(isstring(x))

Example

Check if an object is an list or not:

call x = ["apple", "banana"]
echo(islist(x))

Example

Check if an object is an function or not:

group my_function()
  give "Return from a function"
end

echo(isgroup(x))