noun
conditional construct
A programming language construct that executes code based on a condition, such as if-then-else or switch-case. Used in computing contexts.
このプログラミング言語では、条件構成体としてif文とswitch文が使える。
In this programming language, you can use if statements and switch statements as conditional constructs.
条件分岐 refers to conditional branching in general, while 条件構成体 specifically denotes the syntactic construct that implements it.
Compound of 条件 (condition) + 構成 (structure, construct) + 体 (body, form). A technical term likely calqued from English 'conditional construct'.