Certified Associate JavaScript Programmer case studies
Certified Associate JavaScript Programmer · Put your knowledge to work in context.
The Certified Associate JavaScript Programmer credential is offered by the JS Institute, a project venture established in 2021 and run by OpenEDG. The JS Institute provides independent, vendor-neutral certification programs in the JavaScript programming language, delivered in cooperation with schools, colleges, universities, training companies, and IT industry leaders. These programs are available through the OpenEDG Testing Service, OnVUE Online Proctoring, and a network of 5,000 accredited Pearson VUE testing centers. This associate-level credential is designed for candidates who want to validate their foundational JavaScript programming skills in a vendor-neutral context. The Certified Associate JavaScript Programmer case studies are 5 cases and about 3,061 words.
1Zero-Delay Timer vs Promise Callback in a Checkout Widget
A checkout page delegates post-click work to a small module. The module runs: The developer expected timeout-0 immediately after end , but the console shows both promise callbacks first.
599 words, about 3 min2Five Row Buttons That All Report Row 5
A reporting screen builds five row buttons in a for loop. The loop variable is declared with var , and each button gets the same click handler: Clicking any button logs Opening row 5 .
682 words, about 3 min3Cart Total Loses `this` When Passed as a Callback
A storefront has a cart object with a method that computes a total: cart.total() returns 30 . But document.querySelector('#total').addEventListener('click', cart.total) throws TypeError: Cannot read properties of undefined (reading 'reduce') .
599 words, about 3 min4Shared Wishlist Array on the Prototype
A small wishlist feature uses a constructor and puts the items array on the prototype: Both users see the same list. A developer checks ana.hasOwnProperty('items') and gets false , then proposes moving items into the constructor.
567 words, about 3 min5Price Table Sorts Lexicographically and Produces NaN
A price table loads five strings from a JSON endpoint: ['10', '2', '100', '25', '5'] . The developer writes: The table shows 10, 100, 2, 25, 5 , and several cells display NaN .
614 words, about 3 min