Javascript's recursive function is only triggered once

Question

Javascript's recursive function is only triggered once

I have written a code snippet to traverse through a JSON tree and extract specific keys. However, I am facing an issue where the recursion only works once for keys labeled as "complexType" which have a tree node with additional elements. Subsequent iterations do not get called.

function retrieveKeys(json){
    sequence = json["sequence"]["element"]        
    for(i=0;i<sequence.length;i++){
        innerSequence = sequence[i]         
        if(innerSequence["complexType"] != undefined){
            retrieveKeys(innerSequence["complexType"])
        }
    }
}

For the complete JSON file, you can refer to this link.

javascript json recursion

Answer 1

Answer №1

You have a global variable loop! In JavaScript, any references or assignments made without var, let, or const are considered global.

As a result, every time getStructure is called, i resets to 0 for all instances. The variables sequence and innerSequence are also treated as globals.

Furthermore, the function's name suggests it should return something other than undefined, which is its current outcome.

There are semicolons missing in your code. Utilizing "use strict" mode can help prevent situations where the browser interprets your code differently than intended.

Answer 2

You have a global variable loop! In JavaScript, any references or assignments made without var, let, or const are considered global.

As a result, every time getStructure is called, i resets to 0 for all instances. The variables sequence and innerSequence are also treated as globals.

Furthermore, the function's name suggests it should return something other than undefined, which is its current outcome.

There are semicolons missing in your code. Utilizing "use strict" mode can help prevent situations where the browser interprets your code differently than intended.

Javascript's recursive function is only triggered once

Answer №1

Similar questions

Hey there, I'm looking to use different CSS fonts on Windows and Mac for the same page on a web application. Can someone please guide me on how to accomplish this?

Transmitting the character symbol '&' within a string from Angular to PHP

Angular's ng-submit directive does not use the most up-to-date scope available

Function for JavaScript Form Validation: Iterating through each element

Re-rendering multiple components with the new `use` feature in React version 18.3.0

Issue with Node Canvas/Resemble.js: The image provided has not finished loading during the load operation

Convert a JavaScript array of objects into an array of arrays

The onUpdate function does not seem to be functioning as expected in the react-custom-scrollbars

Utilizing VueJS and Lodash: The technique for extracting an array of objects exclusively featuring a specific key string

Implementing mouse hover functionality for fieldset in EXTJS

AngularJS meta tags featuring dynamic asynchronous content

Is Eval really as bad as they say... What alternative should I consider using instead?

I'm looking to send JSON data using jQuery's AJAX method - how can I

Switching effortlessly between Fixed and Relative positioning

Triggered by each user interaction, the callback function is activated

Combine two JSON objects with the same key

Graph using chartjs-node-canvas in dark mode

How to initiate a download via a GET request in axios

What is causing the warnings for a functional TypeScript multidimensional array?

Tips on modifying JSON information from various collections of key-value pairs