Case sensitivity, semicolons, and white space
In JavaScript programming, variable case sensitivity, program syntax semicolon, and white space play an important role in the proper interpretation and execution of JavaScript program source code. While case sensitivity treats program variables differently in uppercase and lowercase, the semicolon operator properly terminates JavaScript program important line row syntax, similarly white space is used to add necessary spaces in JavaScript programs.
So, let’s get to know more about case sensitivity, semicolon and white space in JavaScript programming.
Case Sensitivity in JavaScript.
JavaScript programming is case-sensitive, which means that the code written in JavaScript programs differentiates between uppercase and lowercase source code characters. Case sensitivity affects JavaScript program variables, program function names, and other program identifiers in the program execution order. For example, in a JavaScript program the variables course and Course will be treated as two different program identifiers by JavaScript.
Example of JavaScript programming case-sensitive variable declaration.
let course = “Javasript”; // Here is a variable named “course”
let Course = “Javascript”; // Here is a different variable named “Course” declared
console.log(course); // Result is – JavaScript
console.log(Course); // Result is – JavaScript
Here in the above program example, course and Course are two different program variables written in case sensitive sentence case format and differ from each other only in capitalization.
Important Points of JavaScript Programming Case-sensitive.
Where in the JavaScript program course, Course and COURSE all three variables are different from each other, they will be treated differently by JavaScript at the program execution time.
Remember, user-defined function names, created class names, and other program identifiers declared and used in JavaScript programs may be case-sensitive depending on the usage.
Keywords used in JavaScript programming such as let, const, function, etc. may also be case-sensitive, so they should always be written in lowercase character format.
Semicolons in JavaScript.
In JavaScript programming, the semicolon (;) operator is used to terminate important program statements written in JavaScript programs. Semicolons sometimes have optional use cases in JavaScript, but there are times when they are necessary to terminate program logic statements, especially in JavaScript programs for clarity and to avoid potential problems with automatic semicolon insertion (ASI) Features.
JavaScript Automatic Semicolon Insertion (ASI) Features.
JavaScript programming has a built-in feature called Automatic Semicolon Insertion, which is used by JavaScript program interpreter to automatically insert semicolons in the current program, sometimes they disappear automatically in the program. So, it is always safer to use semicolon operator manually in JavaScript program.
Javascript program example without semicolon with ASI function.
let language = “Javascript”
let duration = 2
console.log(language)
console.log(duration)
In this JavaScript program example, all the methods will work properly, because here JavaScript will automatically insert semicolons at the end of each row.
Javascript program example with semicolons.
let language = “python”; // Here semicolon operator is added explicitly
let price = 799; // Here the semicolon operator is also explicitly added to the price variable
console.log(language); // Result is – Python
console.log(price); // Result is – 799
While the JavaScript programming syntax allows the programmer to ignore the semicolon operator at the end of the row statement, but in the best JavaScript program design development, you must add them to avoid any kind of potential harm. For example, sometimes ignoring the semicolon operator in a JavaScript program can sometimes create problems in the program. Sometimes when rows of the function program source code are created in an unexpected way, especially in JavaScript return statements or while using certain operators, you must manually add the semicolon operator every time.
Semicolon in JavaScript Programs Potential Harm ASI Problem.
let p = 3
let q = 1
let add = p + q
(function() { // Here without semicolon operator before the function it may display error
console.log(“testing”);
})();
Here in this example, if no semicolon operator is added after let add = p + q variable, then this code may generate error in the JavaScript program, as it may misinterpret the function call as part of the previous statement.
White Space in JavaScript.
In JavaScript programming, white space, tab, and newline characters are basically used to separate program source code elements such as JavaScript program variables, operators, and keywords used in the program. White space does not affect the default execution of program source code in JavaScript, but plays an important role in the existing program readability and program organization.
Examples of JavaScript programs using white space.
let courseName = “Javascript”; // Here space is used between variable courseName, assignment operator, and variable value
let duration = 2;
let coursedetail = courseName + ” ” + duration;
console.log(coursedetail); // Result is – Javascript 2
JavaScript automatically ignores extra white space in the programming program, so JavaScript programmers can use as much white space as needed, as long as it is between different JavaScript program source code elements. White space allows JavaScript programs to develop clear and readable program source code.
JavaScript program examples with extra white space.
let coding = “java” ; // This white space variable declaration works fine, but in a slightly less readable format.
While JavaScript programming ignores excessive white space in any program, using excessive white space in a JavaScript program can harm the readability of that program’s source code, therefore, it is important to use it wisely and only when needed. While traditionally JavaScript programs use a single space after keywords and operators, and indentation is usually considered to be 2 or 4 spaces to structure your code, it is generally considered appropriate.
Important uses with JavaScript programs white space.
Line breaks (newlines) – Newlines in a JavaScript program are used to separate statements or move or preview statements to the next line.
let courseName = “Javascript”;
let coursePrice = “999”;
Indentation – Indentation in JavaScript programs is important to make the program source code readable, but it does not affect the default execution method of your program source code. It is a common practice to use 2 or 4 spaces as an indentation level in a JavaScript program, depending on the need. Consistent indentation helps in program source code blocks, especially in program loops and functions.
function coding() {
let display = “This is, Javasript test code!”;
console.log(display);
}
Summary of JavaScript Case sensitivity, semicolons, and white space.
- Case sensitivity – In JavaScript program course and Course are treated as two different program variables or behave as identifiers, so it is important to have program variables compatible with case sensitivity variable declaration with capitalization as required.
- Semicolons – Semicolon operator is used to terminate statements in JavaScript program. Even though automatic semicolon entry is optional in JavaScript programming due to ASI, it is a good option to explicitly use the required semicolon operator to avoid program errors.
- Semicolons – White space in JavaScript program Space, tab, newline etc. helps to arrange and properly structure the JavaScript program source code. It is important for existing program readability, but, white space is unnecessary in excessive programs.
