Hi,
For a gallery I was writing, I needed to traverse an array in a loop
way, allowing me to move it forward or backward to create a carousel
effect on an image list, so I wrote this tiny "class" for that. As you
can see I didn't write any validations. You are free to fix, extend,
derivate or copy and I would appreciate if you post any modifications
here.
/*--------------------------*/
function Loopr(_arr) {
this.array = _arr;
this.position = -1;
this.next = function() {
(!(++this.position < this.array.length)) && (this.position = 0);
return this.array[this.position];
}
this.prev = function() {
(!(--this.position > -1)) && (this.position = this.array.length
-
1);
return this.array[this.position];
}
}
// Tests
var test = ['a', 'b', 'c'], loopr, resultTests;
loopr = new Loopr(test);
resultTests = [];
resultTests.push(loopr.next());
resultTests.push(loopr.next());
resultTests.push(loopr.next());
resultTests.push(loopr.next());
resultTests.push(loopr.next());
resultTests.push(loopr.next());
// result: 'a', 'b', 'c', 'a', 'b', 'c'
loopr = new Loopr(test);
resultTests = [];
resultTests.push(loopr.prev());
resultTests.push(loopr.prev());
resultTests.push(loopr.prev());
resultTests.push(loopr.prev());
resultTests.push(loopr.prev());
resultTests.push(loopr.prev());
// result: 'c', 'b', 'a', 'c', 'b', 'a'
/*--------------------------*/
I hope it helps someone.
Leonardo Braga
@LeonardoBraga
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