An example of how to count the number of characters in a file using kotlin

preface

For developers, counting the number of characters in a file is a common program. Today, use the kotlin you just learned to realize it. I won't say much now. Let's take a look at the detailed introduction.

The method is as follows:

First, find a file to count.

Then establish a HashMap to store the statistical results.

Read the file content and convert it into char for traversal statistics

Readtext() reads the contents of the file

Tochararray() to char array

Filternot (char:: iswhitespace) ignores spaces

During traversal, the currently traversed map [it] is assigned to count. If this character is not found in the map, that is, count = = null, it is the first record, and map [it] is 1. Otherwise, map [it] has been recorded, and 1 is added to the original count.

Finally, the statistical results are output

The implementation effect is as follows

The above reading is not concise enough. We can simplify it a little more. There is no need to declare HashMap at all.

Can achieve the same effect. This is functional programming.

Attached: HashMap structure diagram

summary

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