CODEWITHSUNDEEP
kotlin
Wesley
Wesley

Reputation: 5621

Prevent String.Contains from matching empty

I'm running a filter command on an object in kotlin and trying to match results. I didn't realize until today that an empty string will match any string in a contains query as follows:

var brandname = ""
var brandtofind = "tide"
var result = brandtofind.contains(brandname) //results in true

This is problematic when you are trying to match entries where a string can be empty as follows:

var candidates = this.filter{ product -> 
                  text.contains(product.name) ||
                  text.contains(product.brandname) //brandname often empty

I get massive numbers of false positives on products without a brand name. How do I alter the query to only match when there is a true match?

Upvotes: 0

Views: 33

Answers (1)

leonardkraemer
leonardkraemer

Reputation: 6793

You can add a check for product.brandname.isNotBlank(), which is an enhanced verions of isNotEmpty()

var candidates = this.filter{ product -> 
                  text.contains(product.name) ||
                  (product.brandname.isNotBlank() && text.contains(product.brandname))}

Upvotes: 2

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