JS syntax rules
JavaScript syntax is a set of rules that dictate how JavaScript code should be written. Here are some key components of JavaScript syntax:
- Statements: JavaScript code is made up of statements, which are instructions that tell the computer what to do. Statements typically end with a semicolon (;).
Example: let x = 5;
- Variables: JavaScript uses variables to store data values. Variables are declared using the
let
,const
, orvar
keywords.
Example: let name = "John";
- Operators: JavaScript uses operators to perform actions on data values. Some common operators include arithmetic operators (+, -, *, /), comparison operators (==, !=, <, >), and logical operators (&&, ||).
Example: let x = 10 + 5;
- Functions: JavaScript functions are blocks of code that can be called to perform a specific task. Functions can take arguments (values passed into the function) and return a value.
Example:
javascriptfunction addNumbers(a, b) {
return a + b;
}
let sum = addNumbers(5, 10);
- Objects: JavaScript objects are collections of properties and methods. Properties are variables that hold values, and methods are functions that can be called on the object.
Example:
javascriptlet person = {
name: "John",
age: 30,
greet: function() {
console.log("Hello, my name is " + this.name + " and I'm " + this.age + " years old.");
}
};
person.greet(); // outputs "Hello, my name is John and I'm 30 years old."
These are just a few examples of JavaScript syntax. There are many more components to JavaScript syntax, including control structures (if/else statements, loops), arrays, and more
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