JS Syntax
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JS Syntax
In programming, syntax refers to the rules that define how a programming language’s statements should be structured. In JavaScript, the syntax specifies the structure of the code, including how statements, expressions, variables, and functions are written.
Here are some key aspects of JavaScript syntax:
- Statements: JavaScript statements are typically terminated with a semicolon (;) at the end of each statement. However, semicolons are not strictly necessary, and JavaScript allows you to omit them in some cases.
- Variables: JavaScript variables are declared using the let, const, or var keywords, followed by the variable name. For example, let x = 5; declares a variable named x with a value of 5.
- Functions: JavaScript functions are declared using the function keyword, followed by the function name, a set of parentheses that can contain parameters, and a set of curly braces that contain the function’s code. For example,
function add(a, b) {
return a + b;
}
declares a function named add that takes two parameters (a and b) and returns their sum.
- Expressions: JavaScript expressions are pieces of code that can be evaluated to a value. They can consist of variables, operators, and function calls. For example, x + y is an expression that evaluates to the sum of the variables x and y.
- Comments: JavaScript supports both single-line and multi-line comments. Single-line comments start with //, while multi-line comments are enclosed in /* and */. Comments are used to provide explanations and context for code and are ignored by the JavaScript interpreter.
Overall, understanding JavaScript syntax is essential for writing effective and readable code in the language.
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