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Hoisting is a behavior in JavaScript where variable declarations and function declarations are moved to the top of their respective scopes during the compilation phase, before the code is executed. This means that variables and functions can be used before they are declared in the code. For example, if you

In JavaScript, there are three ways to declare a variable: using the "var", "let", and "const" keywords. Each of these keywords has slightly different behavior and scoping rules: "var": This keyword was used in older versions of JavaScript and is still supported

In JavaScript, null and undefined are both used to represent the absence of a value, but they have slightly different meanings. Undefined is a value automatically assigned to a variable that has been declared but has not been initialized with a value, or to a function parameter that has not

In JavaScript, you can declare boolean values using the "boolean" data type, which can have only two possible values: true or false. Here are some examples: // Declaration of boolean values let isTrue = true; let isFalse = false; // Boolean operations let result1 = isTrue && isFalse; // logical AND let result2

In JavaScript, you can declare strings using the "string" data type. Here are some examples: // Declaration of strings let str1 = "Hello, world!"; // using double quotes let str2 = 'JavaScript is awesome'; // using single quotes let str3 = `The result is ${num1 + num2}`; // using backticks for template

In JavaScript, you can declare numbers using the "number" data type. Here are some examples: // Declaration of numbers let num1 = 10; // integer number let num2 = 3.14; // floating-point number // Mathematical operations with numbers let sum = num1 + num2; // addition let diff = num1 - num2; // subtraction let product = num1 * num2;