What the strategy pattern is
The strategy pattern is a software design pattern that lets you define a family of algorithms, put each one behind a common interface, and make them interchangeable. This allows the particular algorithm a program uses to be selected and swapped, even while the program is running. The strategy pattern is a classic way to make behavior flexible rather than fixed in place.
Interchangeable algorithms
The heart of the strategy pattern is that several different ways of doing something - several strategies - share a common interface, so they can be used interchangeably. Code that needs the behavior works with the common interface rather than any specific algorithm. This means one strategy can be substituted for another without changing the code that relies on it, as long as they share that interface.
Choosing behavior at runtime
Because the strategies are interchangeable, the program can choose which one to use while it is running, based on the situation. This is more flexible than hard-coding a single approach. For example, a program might select among different strategies depending on conditions or settings, switching behavior dynamically without needing separate versions of the surrounding code for each case.
Why the pattern helps
The strategy pattern helps by separating a particular behavior from the code that uses it. This makes it easy to add new strategies or change existing ones without disturbing the rest of the program. It also keeps individual algorithms focused and self-contained. The result is software whose behavior can be extended and varied cleanly, rather than through tangled conditional logic.
Strategy among design patterns
The strategy pattern is one of the well-known design patterns that describe reusable solutions to common design problems. Giving it a name provides a shared vocabulary: saying a design uses the strategy pattern conveys that interchangeable algorithms sit behind a common interface. Recognizing this pattern helps developers build and discuss software with flexible, swappable behavior.
Why it matters
The strategy pattern is a fundamental design pattern for flexible behavior. Understanding what it is - a family of interchangeable algorithms that can be selected at runtime - clarifies a clean way to vary what a program does. For anyone learning software design, the strategy pattern is a valuable concept that leads to more adaptable and maintainable code.
Related on Skillo
See also: What is a design pattern? Explained, What is an algorithm? Explained simply.
Sources
Published date reflects the original event date (2025-01-21). This article is original Skillo editorial written from the sources above; facts were verified in September 2026.
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