Which Programming Languages Dominate 2021? IEEE Spectrum’s Ranking Revealed
The article examines IEEE Spectrum's 2021 programming language ranking, compares it with Stack Overflow and TIOBE surveys, explains the methodology using eight data sources and eleven metrics, and highlights Python's surge alongside the enduring popularity of Java, C, C++, and JavaScript.
In today's fast‑changing tech landscape, software development and programming languages are heavily influenced by emerging technologies such as machine learning and artificial intelligence.
IEEE Spectrum recently published its 2021 Programming Language Rankings. The overall top five are Python, Java, C, C++, and JavaScript, with the ranking covering four language categories: Web, Enterprise, Mobile, and Embedded.
This differs from the Stack Overflow 2021 Developer Survey, which places JavaScript as the most used language (65%), followed by Python (48.2%) and Java (35.35%). Rust ranks highest in developer love, while Python does not dominate the “most loved” list.
IEEE’s methodology combines eight information sources—Google, Twitter, GitHub, Stack Overflow, Reddit, Hacker News, CareerBuilder, and IEEE—and evaluates eleven specific metrics:
Google search click count for the term "X programming".
Google Trends index for "X programming".
Twitter click count for "X programming".
Number of new repositories for each language on GitHub.
Number of active repositories for each language on GitHub.
Number of Stack Overflow questions mentioning each language.
Number of Reddit posts mentioning each language.
Number of Hacker News posts mentioning each language.
Job demand for each language on CareerBuilder.
Job demand for each language on IEEE Job Site.
Number of IEEE Xplore articles mentioning each language.
Python’s popularity has surged in recent years, driven by its use in big data, data mining, and AI, and its ease of learning has attracted both professional developers and non‑technical data practitioners. Chinese interest, measured by Baidu Index, also shows a steady rise.
Since 2018, Python’s attention has climbed rapidly, earning top spots in the TIOBE index for 2018 and 2020.
Domestic interest, reflected by Baidu Index, also shows an upward trend.
The IEEE Spectrum 2021 top‑ten languages are: Python, Java, C, C++, JavaScript, C#, R, Go, HTML, and Swift. HTML is included as a programming language.
These five languages (Python, Java, C, C++, JavaScript) dominate most language rankings, including the TIOBE September top‑10 list.
GitHub activity charts also show strong presence of these languages in open‑source projects.
Stack Overflow popularity data further illustrate language usage trends.
The complete IEEE Spectrum 2021 ranking is shown below.
IEEE’s ranking reflects current mainstream programming language trends and can serve as a reference for learning and career decisions, though each language has its own suitable application scenarios.
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