Index of a substring in ClojureScript

Question

There doesn't seem to be a built-in CLJS method to check for the index of a substring (e.g. the index of "scr" in "clojurescript" is 7). This can be done with regexes as described in this question, but that's quite verbose and is a little bit overkill for common use. Is there any way to quickly and easily check for the existence of a character or substring within a string?

Chase Sandmann · Accepted Answer · 2014-12-16 19:35:44Z

9

Because ClojureScript has access to all native JavaScript, we can use built-in JS functions like .indexOf. This makes it fairly simple to do things like:

> (.indexOf "clojurescript" "scr")
  7

As Joaquin noted, this also makes it very simple to determine the existence of a substring as well:

> (not= -1 (.indexOf "clojurescript" "scr"))
  true
> (not= -1 (.indexOf "clojurescript" "asd"))
  false

edited Dec 16, 2014 at 19:35

answered Dec 15, 2014 at 22:39

Chase Sandmann

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2 Comments

Joaquin Over a year ago

I would suggest you update the answer for the question: > Is there any way to quickly and easily check for the existence of a character or substring within a string? (= -1 (.indexOf "clojurescript" "asd"))

Chase Sandmann Over a year ago

Good suggestion! That's actually what I was using it for in my code - I don't know how I forgot!

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