The Enumerable.eachSlice method , or the documentation is faulty! Just
adjust the src attribute to point to your copy of Prototype and try this to
see why!
It's because the slice native array method always returns an array every
time it's called, so the output will never be:
[['Sunny', 'Audrey', 'Matt'], ['Amelie', 'Will']], but an array with two
undefined values!
.Either the iterator function should act accordingly as in the oroginal
inGroupsOf method, or preferably the two methods should be adjusted for
something like the ones below:
Probably you will never use these methods, but they are parts of the public
interface, so they should work properly!
function eachSlice(number, iterator, context) {
var index = -number, slices = [], array = this.toArray();
if (number < 1) return array;
while ((index += number) < array.length)
slices.push(array.slice(index, index+number).collect(iterator,
context));
return slices;
}
function inGroupsOf(number, fillWith, iterator){
fillWidth = Object.isUndefined(fillWith)? null : fillWith;
var tmp = this.eachSlice(number, iterator), res = [];
tmp.each(function(arr, index){
while(arr.length < number){
arr.push(fillWith);
}
res.push(arr);
});
return res;
};
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd";>
<html xmlns="http://www.w3.org/1999/xhtml";>
<head>
<meta http-equiv="Content-type" content="text/html;charset=iso-8859-1" />
<title>Faulty eacSlice method test</title>
<script type="text/javascript" language="javascript"
src="prototype_scripta/prototype_1_7.js"></script>
<script type="text/javascript" language="javascript">
var students = [
{ name: 'Sunny', age: 20 },
{ name: 'Audrey', age: 21 },
{ name: 'Matt', age: 20 },
{ name: 'Amelie', age: 26 },
{ name: 'Will', age: 21 }
];
var student_names = students.eachSlice(3, function(student, count) {
if(typeof student.name == 'undefined'){alert(count + ' -student is an
array!!');}
return student.name;
});
for(var i = 0; i < student_names.length; i++){
alert(typeof student_names[i]);
}
</script>
</head>
<body>
<div>Nothing to see here.</div>
</body>
</html>
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