/CSS/Var units = "years"; var davidAge = 65; var johnAge = 40; var ageDifference = davidAge - johnAge; alert("The age difference is " + ageDifference + " " + units);

Var units = "years"; var davidAge = 65; var johnAge = 40; var ageDifference = davidAge - johnAge; alert("The age difference is " + ageDifference + " " + units);

The code is more readable with an appropriately named variable, 
rather than including an arithmetic expression 
inside of parentheses inside of a concatenation.

Source: canvas.instructure.com

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