Category talk:Wren-seq: Difference between revisions

Content added Content deleted
(→‎Source code: Added Seq.write and Seq.print methods.)
(→‎Source code: Added 'takeWhile' and 'skipWhile' methods to Seq class plus other small changes.)
Line 18: Line 18:
return true
return true
}
}

// Returns a new 'lazy' sequence that iterates only the last 'count' elements of
// Returns a new 'lazy' sequence that iterates only the last 'count' elements of
// the original sequence.
// the original sequence.
Line 28: Line 27:
count = s.count - count
count = s.count - count
if (count <= 0) count = 0
if (count <= 0) count = 0
return s.skip(count)
return SkipSequence.new(s, count)
}
}


Line 38: Line 37:
Fiber.abort("Count must be a non-negative integer.")
Fiber.abort("Count must be a non-negative integer.")
}
}
count = a.count - count
count = s.count - count
if (count <= 0) count = 0
if (count <= 0) count = 0
return a.take(count)
return TakeSequence.new(s, count)
}

// Returns a new 'lazy' sequence that iterates the elements of
// the original sequence only while they continue to satisfy a predicate.
static takeWhile(s, pred) {
isSeq_(s)
if (!((pred is Fn) && pred.arity == 1)) {
Fiber.abort("Predicate must be a function which takes a single argument.")
}
var count = 0
for (e in s) {
if (!pred.call(e)) break
count = count + 1
}
return TakeSequence.new(s, count)
}

// Returns a new 'lazy' sequence that skips the elements of
// the original sequence only while they continue to satisfy a predicate.
static skipWhile(s, pred) {
isSeq_(s)
if (!((pred is Fn) && pred.arity == 1)) {
Fiber.abort("Predicate must be a function which takes a single argument.")
}
var count = 0
for (e in s) {
if (!pred.call(e)) break
count = count + 1
}
return SkipSequence.new(s, count)
}
}


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