lib/api/encodeNavigation.js
function encodeNavigation(output) {
    var book = output.getBook();
    var pages = output.getPages();
    var summary = book.getSummary();
    var articles = summary.getArticlesAsList();


    var navigation = articles
        .map(function(article, i) {
            var ref = article.getRef();
            if (!ref) {
                return undefined;
            }

            var prev = articles.get(i - 1);
            var next = articles.get(i + 1);

            return [
                ref,
                {
                    index: i,
                    title: article.getTitle(),
                    introduction: (i === 0),
                    prev: prev? encodeArticle(pages, prev) : undefined,
                    next: next? encodeArticle(pages, next) : undefined,
                    level: article.getLevel()
                }
            ];
        })
        .filter(function(e) {
            return Boolean(e);
        });

    return Immutable.Map(navigation).toJS();
}
function encodeNavigation(output) {
    var book = output.getBook();
    var pages = output.getPages();
    var summary = book.getSummary();
    var articles = summary.getArticlesAsList();


    var navigation = articles
        .map(function(article, i) {
            var ref = article.getRef();
            if (!ref) {
                return undefined;
            }

            var prev = articles.get(i - 1);
            var next = articles.get(i + 1);

            return [
                ref,
                {
                    index: i,
                    title: article.getTitle(),
                    introduction: (i === 0),
                    prev: prev? encodeArticle(pages, prev) : undefined,
                    next: next? encodeArticle(pages, next) : undefined,
                    level: article.getLevel()
                }
            ];
        })
        .filter(function(e) {
            return Boolean(e);
        });

    return Immutable.Map(navigation).toJS();
}
function encodeNavigation ( output ) { var book = output . getBook ( ) ; var pages = output . getPages ( ) ; var summary = book . getSummary ( ) ; var articles = summary . getArticlesAsList ( ) ; var navigation = articles . map ( function ( article , i ) { var ref = article . getRef ( ) ; if ( ! ref ) { return undefined ; } var prev = articles . get ( i - 1 ) ; var next = articles . get ( i + 1 ) ; return [ ref , { index : i , title : article . getTitle ( ) , introduction : ( i === 0 ) , prev : prev ? encodeArticle ( pages , prev ) : undefined , next : next ? encodeArticle ( pages , next ) : undefined , level : article . getLevel ( ) } ] ; } ) . filter ( function ( e ) { return Boolean ( e ) ; } ) ; return Immutable . Map ( navigation ) . toJS ( ) ; }
this.navigation is a deprecated property from GitBook v2

@param {Output}
@return {Object}
this . navigation is a deprecated property from GitBook v2