fullcalendar/src/common/HorizontalPositionCache.js

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function HorizontalPositionCache(getElement) {
var t = this,
elements = {},
lefts = {},
rights = {};
function e(i) {
return elements[i] = elements[i] || getElement(i);
}
t.left = function(i) {
return lefts[i] = lefts[i] === undefined ? e(i).position().left : lefts[i];
};
t.right = function(i) {
return rights[i] = rights[i] === undefined ? t.left(i) + e(i).width() : rights[i];
};
t.clear = function() {
elements = {};
lefts = {};
rights = {};
};
}