JavaScript Coding Specialist Certification

This exam validates the candidate’s ability to recognize and write syntactically correct JavaScript code, use data types supported by JavaScript, and be able to recognize and write JavaScript code that will logically solve a given problem.

It is recommended that candidates have at least 150 hours of instruction or hands-on experience with the JavaScript programming language before taking this exam. Candidates should also be familiar with JavaScript features and capabilities, and understand how to write, debug, and maintain well-formed, well-documented JavaScript code.

Skills Measured:

1. Basic grammar, variable declarations, data types and literals
2. JavaScript operators and expressions
3. Control flow, loops, iterations and error handling
4. Functions
5. Working with Objects in JavaScript
6. Interact with the Document Object Model
7. Interact with HTML Forms

Objective Domain

1. JavaScript basics, variable declarations, data types and literals

1.1. JavaScript basics and comments

introduction to JavaScript; comments in JavaScript;

1.2. JavaScript variables and variable declarations

variables; variable declarations: var, let and cons; declaring variables; variable scope; global variables; constants; hoisting;

1.3. JavaScript data structures and types

data types: primitives (Boolean, null, undefined, Number, BigInt, String, Symbol ), Object; data type conversion; numbers and the ‘+’ operator; converting strings to numbers

1.4. JavaScript literals

Array literals; Boolean literals; Floating-point literals; Numeric literals; Object literals; RegExp literals; String literals

2. JavaScript operators and expressions

2.1. Types of operators and operator precedence

assignment; comparison, arithmetic operators, bitwise operators, logical operators, string operators, conditional (ternary) operator, comma operator, unary operator, relational operator;

2.2. Expressions

primary expressions; left-hand-side expressions;

3. Control flow, loops, errors and error handling

3.1. Control flow statements

Block statement; Conditional statement: if…else, switch

3.2. Loops and iterations statements

for statement; do…while statement; while statement; labeled statement; break statement; continue statement; for…in statement; for…of statement

3.3. Errors and Exception handling statement

throw statement; try…catch statement; final

4. Functions

4.1. Defining functions

4.2. Calling functions

4.3. Function scope

4.4. Function parameters

4.5. Arrow functions

5. Working with Objects in JavaScript

5.1. Objects and properties

5.2. Enumerate the properties of an object

5.3. Creating new objects

5.4. Inheritance

5.5. Comparing objects

5.6. Number and Date objects

5.7. Math Object and built-in Math functions (random; round; abs; floor; ceiling; min; max; pow; sqrt)

6. Interact with the Document Object Model and Browser Object Model

6.1. Construct the Document Object Model (DOM) tree

window; document; body; other HTML elements

6.2. Handle HTML events

onchange; onmouseover; onload; onclick; onmouseout; onkeydown

6.3. Output to an HTML document

innerHTML; write

6.4. Locate, modify and add HTML elements and attributes

getElementByld; getElementsByTagName; getElementsByClassName; setAttribute; createElement

6.5. Interact with the Browser Object Model (BOM)

manage state; display dialogs; determine screen size

7. Interact with HTML forms

7.1. Retrieves input from forms and sets form field values

retrieve form values; get values from different types of elements; prepopulate values; mask values; identify the DOM path;

7.2. Input validation

case; string comparisons; Not-A-Number (NaN)

7.3. Form submission

onsubmit; post versus get; potential targets for submission