map-example.js

// example for scroll instances caching es6

const scrollInstancesMap = new Map();
​
const scrollContainer = document.querySelector('.frontpage-content__container');
​
const currentScroller = scrollInstancesMap.get(scrollContainer);
​
if (currentScroller) {
    currentScroller.scrollToElement(someElement)
} else {
    const scroller = new ScrollLibrary(scrollContainer);
​
    scrollInstancesMap.set(scrollContainer, scroller);
​
    oldScroller.scrollToElement(someElement)
}
​
​
// example for scroll instances caching es5
​
var scrollContainerNames = [];
var scrollInstances = [];
​
var oldScrollerIndex = scrollContainerNames.findIndex( scrollContainerEl => scrollContainerEl === scrollContainer );
​
if (oldScrollerIndex) {
    const oldScroller = scrollInstances[oldScrollerIndex];
​
    oldScroller.scrollToElement(someElement)
} else {
    var scroller = new ScrollLibrary(scrollContainer);
​
    scrollContainerNames.push(scrollContainer);
    scrollInstances.push(scroller);
​
    scroller.scrollToElement(someElement)
}