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  • Gin Wong thinks this is interesting:

Of course, you could name w and h something else, like svgWidth and svgHeight. Use whatever is most clear to you. JavaScript programmers, as a group, are fixated on efficiency, so you’ll often see single-character variable names, code written with no spaces, and other hard-to-read, yet programmatically efficient, syntax.

From

Cover of Interactive Data Visualization for the Web, 2nd Edition

Note

Not true. Descriptive variable names are way more important and in fact improves efficiency.