src/aria/pageEngine/utils/PageEngineUtils.js
function (item, container) {
            if (item && !ariaUtilsArray.contains(container, item)) {
                container.push(item);
            }
        }
function (item, container) {
            if (item && !ariaUtilsArray.contains(container, item)) {
                container.push(item);
            }
        }
function ( item , container ) { if ( item && ! ariaUtilsArray . contains ( container , item ) ) { container . push ( item ) ; } }
Add an item inside a container only if it is not already there
@param {MultiTypes} item
@param {Array} container
Add an item inside a container only if it is not already there