if & elif & else

if...else Statement

The if...else statement executes a statement if a specified condition is truthy. If the condition is falsy, another statement in the optional else clause will be executed.

Syntax

if condition do
    // code executed if condition is truthy
end else do
    // code executed if condition is falsy
end

You can also chain multiple conditions using elif:

if condition1 do
    // executes if condition1 is true
end 
elif condition2 do
    // executes if condition2 is true
end 
else do
    // executes if all conditions are false
end

Using an assignment as a condition

You should almost never have an if...else with an assignment like x = y as a condition:

var x;

// BAD
if ((x = y)) do
  // …
end

// OK
x = y;
if x do
  // …
end

Truthy and Falsy Values

In Ysharp, any value used in a conditional context (such as an if statement) is automatically converted to a boolean.

---

Falsy Values

The following values are considered falsy, meaning they evaluate to false:

• false
• null
• 0
• "" (empty string)

Example

if 0 then do
    print("will not run");
end

if "" then do
    print("will not run");
end

Notes

• Only one branch will execute.
• Conditions are evaluated from top to bottom.
• Use elif to avoid deeply nested if statements.