CODEWITHSUNDEEP
scheme
yrazlik
yrazlik

Reputation: 10777

Comparing lists in scheme

I wonder why the following piece of code gives the #f output:

=> (define a (cons 3 '()))
=> (define a (cons 3 '()))
=> (eq? a b)
;Value: #f

When comparing the lists with eq?, do we look at whether all the values and their order is same, or do we look whether two lists are the same list? Can somebody explain it?

Thanks

Upvotes: 1

Views: 99

Answers (1)

GoZoner
GoZoner

Reputation: 70135

The function eq? looks at whether the 'two lists are the same list'; whereas, equal? looks at 'whether all the values and their order is the same'. In C, think eq? is == but equal? is while (l1 && l2 && equal (l1.item, l2.item) ...

Upvotes: 2

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