![]() Step 2: Perform addition (implicit conversion)Ĭonsole.log(addition) // "52" JavaScript Code Example 8: Convert to Number with Type Coercion Observe how JavaScript performs type coercion in an addition operation. Step 2: Convert to a boolean and check truthinessĬonsole.log(isTruthy) // false JavaScript Code Example 7: Convert to Number with Type Coercion Step 2: Parse to a floating-point numberĬonsole.log(float) // 3.14 JavaScript Code Example 6: Convert to Boolean with Truthy/Falsy CheckĬonvert a value to a boolean and check its truthiness. Step 1: Declare a string with a floating-point number Parse a floating-point number from a string. Step 1: Declare a string with an integerĬonsole.log(int) // 42 JavaScript Code Example 5: Parse Float from String Step 1: Declare a string with a numberĬonsole.log(num) // 123 JavaScript Code Example 2: Convert to StringĬonsole.log(str) // "456" JavaScript Code Example 3: Convert to BooleanĬonsole.log(bool) // false JavaScript Code Example 4: Parse Integer from String 10 coding exercises converting data types in JavaScript JavaScript Code Example 1: Convert to NumberĬonvert a string representing a number to an actual number. It's essential to know when and how to perform explicit type conversions to ensure that your program behaves as expected, especially when dealing with user input and data manipulation. Understanding data type conversion in JavaScript is crucial for writing robust and predictable code. Let subtraction = "5" - 2 // Implicit conversion to number and subtraction Let addition = "5" + 2 // Implicit conversion to string and concatenation Be aware of how types are coerced in expressions: JavaScript performs type coercion in operations, which can lead to unexpected results. You can use isNaN() to check if a value is NaN.Ĭonsole.log(isNaN(converted)) // true 6. If a conversion is not possible, JavaScript returns NaN. Let float = parseFloat(strFloat) // Convert to floating-point numberĬonsole.log(float) // 3.14 5. Let int = parseInt(strInt) // Convert to integer Use parseInt() and parseFloat() to convert strings to integers or floating-point numbers: Let isTruthy = Boolean(value) // Convert to booleanĬonsole.log(isTruthy) // false 4. Empty strings, 0, null, undefined, NaN, and false are considered falsy, while all other values are truthy. JavaScript has a concept of truthy and falsy values. Let bool = Boolean(num) // Explicitly convert to a booleanĬonsole.log(bool) // false 3. Let str = String(num) // Explicitly convert to a string Let num = Number(strNum) // Explicitly convert to a number You can explicitly convert data types using functions like Number(), String(), and Boolean(). Let str = "The answer is " + num // Implicitly converts num to a stringĬonsole.log(str) // "The answer is 42" 2. ![]() For example, when you concatenate a string and a number, JavaScript converts the number to a string. JavaScript performs implicit type conversion automatically when an operation involves different data types. Let's delve into a detailed explanation of data type conversion in JavaScript, including coding examples. Understanding how to convert between data types is essential. ![]() This is a fundamental concept because JavaScript is dynamically typed, meaning variables can change their data type during execution. Var number = parseInt('4%') // percentages (%)Ĭonsole.In JavaScript, data type conversion, also known as type coercion, is the process of converting a value from one data type to another. Var number = parseInt('3in') // inches (in) ![]() Var number = parseInt('2cm') // centimeters (cm) Var number = parseInt('1px') // pixels (px) It makes it possible to parse numbers with units. ParseInt method during conversion ignores all characters that are not digits and occur after the number. ONLINE-RUNNER:browser Ĭonsole.log(number = 123) // true Parsing numbers with unit examples Using the parseInt() method we can also parse floating point number and it will be rounded to an integer, look at the below example. This section shows how to convert with built-in parseInt method some text to an integer. In this article, we can find different ways how to parse integer numbers with parseInt function in JavaScript.
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