What the template method pattern is
The template method pattern is a software design pattern that defines the overall skeleton of an algorithm in a method, while letting subclasses fill in some of the individual steps. The structure and order of the steps are fixed by the template method, but certain steps are left for subclasses to provide. This lets the general process be reused while specific details are customized.
A fixed skeleton
The heart of the pattern is a method that lays out the sequence of steps for an algorithm. This template method calls each step in order, defining the overall flow. Some steps are implemented directly, while others are left as placeholders to be supplied by subclasses. The skeleton stays the same, ensuring the algorithm always follows the intended structure.
Subclasses fill in steps
Subclasses provide the specific behavior for the steps that the template method leaves open. By overriding those steps, different subclasses can customize parts of the algorithm without changing its overall shape. This means the shared structure lives in one place, and only the varying details differ between subclasses, which keeps the common logic from being duplicated.
Why the pattern helps
The template method pattern helps by capturing the invariant parts of an algorithm once, while allowing the variable parts to differ. This promotes reuse, because the common structure is written a single time and shared. It also enforces a consistent process, since subclasses can only change the designated steps, not the overall flow. This balance of reuse and flexibility is valuable.
Template method among design patterns
The template method is one of the classic design patterns for organizing behavior. Describing a design as using the template method conveys that an algorithm's skeleton is fixed while specific steps are left to subclasses. Recognizing this pattern helps developers share common logic cleanly and discuss how algorithms are customized.
Why it matters
The template method pattern is a valuable design pattern for reusing algorithm structure. Understanding what it is - fixing an algorithm's skeleton while subclasses fill in steps - clarifies a clean way to share logic. For anyone learning software design, it is a valuable concept to understand.
Related on Skillo
See also: What is the strategy pattern? Explained, What is inheritance in programming?.
Sources
Published date reflects the original event date (2026-03-31). This article is original Skillo editorial written from the sources above; facts were verified in September 2026.
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