Onto more complex scripting! Conditional code is an important aspect of intermediate to advanced scripts.

Conditional code entails running a chunk of code if a boolean condition evaluates to true. This allows you to execute code that can adapt to conditions in the world, the player, a block, or the entity that's dropping items.

An if statement executes the piece of code if the boolean inside of its bracket evaluates to true.

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val test = 0;

//test == 0 returns a boolean

if (test == 0) { //true
    print("Test is zero!");
}

An else statement can be added to the end of an if statement to execute the block in case the if statement returns false, which means it did not execute.

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var Prueba = 0;

if (Prueba == 0) { //verdadero
    //Se ejecutará cuando prueba es igual a 0
    print("Prueba es cero");
} else {
    //Se ejecutará cuando prueba NO es igual a 0
    print("Prueba NO es cero");
}

Prueba = 1;
if (Prueba == 0) { //falso
    //Se ejecutará cuando prueba es igual a 0
    print("Ahora, prueba es cero");
} else {
    //will be executed when Prueba is not equal to 0
    print("Ahora, prueba no es 0");
}

// Por tanto en nuestro log veremos:
Prueba es cero
Ahora, prueba no es 0

Supported operators you can do calculations with are: +, -, +, /, %. Keep in mind you can also use the logic operators: !, !=, ==, >, >=, <, <=, &&, ||, ^

Apart from these, as long as whatever is inside of the if bracket returns true, you can have anything in there!

Example:

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//In the context of an event:

if (!event.world.remote){
    event.player.sendMessage(MCTextComponent.createStringTextComponent("Successfully completed action!"));
}