Hi Ken,
string-prefix? does exactly what you want.

> (define a "this") (define b "that") (define c "thisandthat")
> (string-prefix? c a)
> (string-prefix? c b)



On Friday, October 28, 2016 at 11:19:26 AM UTC-5, Ken MacKenzie wrote:
> I have two things I am trying to compare, both strings.
> What I want to know is if string a is the beginning of string b.
> Example (pseudo code)
> string a = this
> string b = that
> string c = thisandthat
> a... == c #t
> b... == c #f
> Hope I am making sense here.  I couldn't figure out a way so at present my 
> program does this
> (define alen (length astr))
> (define bpart (substring bstr 0 alen))
> (cond
>   [(string=? astr bpart) #t]
>   [else #f])
> That is working, but it seems like there should be a simpler solution to this.
> Ken

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