A variable in JavaScript is a container that holds a value, which can be a number, string, object, or any other data type. To create a variable, you can use the “let”, “const”, or “var” keyword, followed by the name of the variable. For example, to create a variable called “myVariable”, you can write “let myVariable;”. To initialize a variable, you can assign it a value using the assignment operator “=”. For instance, to initialize “myVariable” to a string value, you can write “myVariable = ‘Hello World’;”. The difference between declaring and initializing a variable is that declaring a variable means creating a reference to it, while initializing means assigning a value to the variable. When naming a variable, it must start with a letter, underscore, or dollar sign and cannot include spaces or special characters. JavaScript provides various arithmetic operators, including addition (+), subtraction (-), multiplication (*), division (/), modulus (%), increment (++), and decrement (–), to perform mathematical operations on variables. Concatenation is the process of combining two or more strings into one. JavaScript provides concatenation operators, such as the plus sign (+) and the “+=” operator, to concatenate strings. The line of code used to prompt a user for a response is “prompt(‘Enter your name:’);”.
A variable in JavaScript is a container that holds a value, which can be a number, string, object, or any other data type. To create a variable, you can use the “let”, “const”, or “var” keyword, followed by the name of the variable. For example, to create a variable called “myVariable”, you can write “let myVariable;”. To initialize a variable, you can assign it a value using the assignment operator “=”. For instance, to initialize “myVariable” to a string value, you can write “myVariable = ‘Hello World’;”. The difference between declaring and initializing a variable is that declaring a variable means creating a reference to it, while initializing means assigning a value to the variable. When naming a variable, it must start with a letter, underscore, or dollar sign and cannot include spaces or special characters. JavaScript provides various arithmetic operators, including addition (+), subtraction (-), multiplication (*), division (/), modulus (%), increment (++), and decrement (–), to perform mathematical operations on variables. Concatenation is the process of combining two or more strings into one. JavaScript provides concatenation operators, such as the plus sign (+) and the “+=” operator, to concatenate strings. The line of code used to prompt a user for a response is “prompt(‘Enter your name:’);”.