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JavaScript Type Conversions

  • Refers to the process of converting a value from one data type to another.
  • Enables you to work with and manipulate different types of data in your programs.

String Conversion

String() Function: Converts a value to a string.

let number = 42;
let stringNumber = String(number); // Result: "42"

Concatenation: Adding an empty string to a value converts it to a string.

let booleanValue = true;
let stringBoolean = booleanValue + ""; // Result: "true"

Number Conversion

parseInt() and parseFloat(): Parse a string and return an integer or a floating-point number.

let stringNumber = "123";
let integerNumber = parseInt(stringNumber); // Result: 123
let floatNumber = parseFloat("3.14"); // Result: 3.14

Unary Plus (+): Converts a value to a number.

let numericString = "42";
let numericValue = +numericString; // Result: 42

Boolean Conversion

Boolean() Function: Converts a value to a boolean.

let numericString = "42";
let numericValue = +numericString; // Result: 42

Implicit Type Conversion (Coercion)

JavaScript also performs implicit type conversion, known as coercion, in certain situations.

Concatenation: Mixing strings and numbers in concatenation automatically converts numbers to strings.

let age = 25;
let message = "I am " + age + " years old."; // Result: "I am 25 years old."

Math Operations: Performing mathematical operations may result in implicit type conversion.

let result = "3" * "2"; // Result: 6 (strings are implicitly converted to numbers)

Understanding type conversions is crucial for working with different data types in JavaScript.

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