Grouping expressions is a way to specify order of evaluation, which is useful if you need to work around operator precedence.

You can group expressions by using ().

For example, the expressions (y2 - y1) and (x2 - x1) below are evaluated before dividing the numbers.

(y2 - y1) / (x2 - x1)
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(y2 - y1) / (x2 - x1)

As an example, take an in-game explosion that scales its damage based on the distance from the player, but where the player's armor can reduce the total damage:

BaseDamage : float = 100
Armor : float = 15

# Scale by square distance between the player and the explosion. 1.0 is the minimum
DistanceScaling : float = Max(1.0, Pow(PlayerDistance, 2.0))

# The farther the explosion is, the less damage the player takes
var ExplosionDamage : float = BaseDamage / DistanceScaling

# Reduce the damage by armor
set ExplosionDamage -= Armor 

# Avoid negative damage values so that explosions can't heal very high armor players.
set ExplosionDamage = Max(0.0, ExplosionDamage) 
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BaseDamage : float = 100 Armor : float = 15 # Scale by square distance between the player and the explosion. 1.0 is the minimum DistanceScaling : float = Max(1.0, Pow(PlayerDistance, 2.0)) # The farther the explosion is, the less damage the player takes var ExplosionDamage : float = BaseDamage / DistanceScaling # Reduce the damage by armor set ExplosionDamage -= Armor # Avoid negative damage values so that explosions can't heal very high armor players. set ExplosionDamage = Max(0.0, ExplosionDamage)

Using grouping, you could rewrite the example above as:

BaseDamage : float = 100
Armor : float = 15
DistanceScaling : float = Max(1.0, Pow(PlayerDistance, 2.0))
ExplosionDamage : float = Max(0.0, (BaseDamage / DistanceScaling) - Armor)
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BaseDamage : float = 100 Armor : float = 15 DistanceScaling : float = Max(1.0, Pow(PlayerDistance, 2.0)) ExplosionDamage : float = Max(0.0, (BaseDamage / DistanceScaling) - Armor)

Grouping expressions can also improve the readability of your code.