JavaScript from Beginner to Professional, Published by Packt
Each chapter contains the example codes explained in the book in the Code Samples directory along with Exercises and Projects from the book arranged chapterwise.
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On page 43, in the console output at the end, the current output text The distance of 130 kms is equal to 209.2142 miles should be The distance of 130 miles is equal to 209.2142 kms.