helpers findChild.ts

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  /**
 * Returns the first child whose evaluation by predicate returns true
 * @param children 
 * @param predicate 
 * @returns The first HTMLElement for which the predicate function returns true
 */
export default function findChild(children: HTMLCollection, predicate: Function) : Element {
 
    if (children.length == 0) {
 
        return null;
    }
 
    for (let i = 0; i < children.length; ++i) {
 
        let child = children[i];
 
        if (predicate(child) === true) {
 
            return child;
        }
 
        child = findChild(child.children, predicate)
 
        if (child !== null) {
 
            return child;
        }      
    }
}