July 2018
Intermediate to advanced
400 pages
12h 14m
English
Content preview from Kotlin Programming: The Big Nerd Ranch Guide, First Edition
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Converting a String to a Numeric Type
If you were to run Tavern.kt right now, you would see a compilation error. This is because the price variable that you are currently passing to performPurchase is a string, and the function expects a double. To the human eye, “5.91” might look like a number, but the Kotlin compiler sees it differently, because it was split from the menuData string.
The good news is that Kotlin includes functions that convert strings to different types – including numbers. Some of the most commonly used of these conversion functions are:
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toFloat
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toDouble
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toDoubleOrNull
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toIntOrNull
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toLong
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toBigDecimal
Attempting to convert a string of the wrong format will throw an exception. ...
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