collections/Tree.js
/**
		 * Returns the count of all descendant nodes by walking the tree. Consequently, this
		 * function is not efficient.
		 *
		 * @public
		 * @returns {Number}
		 */
Returns the count of all descendant nodes by walking the tree. Consequently, this
function is not efficient.

@public
@returns {Number}
Returns the count of all descendant nodes by walking the tree . Consequently this function is not efficient . @public @returns { Number }
count() {
			let count = 0;
			this.walk(() => count ++, true, true);
			return count;
		}
count ( ) { let count = 0 ; this . walk ( ( ) => count ++ , true , true ) ; return count ; }
Returns the count of all descendant nodes by walking the tree.
Returns the count of all descendant nodes by walking the tree .