How to use useState in React
Use useState hook in React to manage component state with functional components for dynamic data and user interactions.
How to use v-model in Vue
Use v-model directive in Vue for two-way data binding between form inputs and component data properties for reactive forms.
How to compare two dates in JavaScript
Compare two dates in JavaScript using comparison operators on Date objects for sorting, validation, and date range checking.
How to get the current date in JavaScript
Get the current date in JavaScript using new Date() constructor for timestamps, date formatting, and time calculations in web applications.
How to get the day of the week in JavaScript
Get the day of the week in JavaScript using getDay() method to return weekday numbers or toLocaleDateString() for day names.
How to get the month name in JavaScript
Get month names in JavaScript using toLocaleDateString() with weekday option for localized month names in any language.
How to subtract days from a date in JavaScript
Subtract days from a date in JavaScript using setDate() method for date calculations, scheduling, and date range operations.
How to add days to date in JavaScript
Add days to dates using setDate() method - automatically handles month/year boundaries and leap years in JavaScript.
How to check if date is today in JavaScript
Check if a date is today using toDateString() comparison - ignores time components and handles timezone consistently.
How to format date as YYYY-MM-DD in JavaScript
Format dates as YYYY-MM-DD using toISOString().split("T")[0] - the most reliable method for ISO date format in JavaScript.
How to get current timestamp in JavaScript
Use Date.now() to get the current timestamp in JavaScript - the fastest and most reliable method for milliseconds since Unix epoch.
How to get yesterday's date in JavaScript
Get yesterday's date using setDate(getDate() - 1) - handles month/year boundaries automatically in JavaScript.
How to find the least common multiple in JavaScript
Calculate LCM using the formula (a * b) / GCD(a, b) with Euclidean algorithm for efficient mathematical computations in JavaScript.
How to find the greatest common divisor in JavaScript
Use Euclidean algorithm with recursive or iterative approach to find GCD efficiently for mathematical computations in JavaScript.
How to find the average of an array of numbers in JavaScript
Calculate array average by dividing the sum by length using reduce() and array length for statistical computations in JavaScript.
How to sum an array of numbers in JavaScript
Use reduce() method to sum array elements efficiently, or loop through values for calculating totals in JavaScript.
How to check if a number is prime in JavaScript
Check if a number is prime by testing divisibility up to its square root for efficient prime number validation in JavaScript.
How to convert degrees to radians in JavaScript
Multiply degrees by π/180 to convert to radians, or use the formula degrees * (Math.PI / 180) in JavaScript.
How to convert radians to degrees in JavaScript
Multiply radians by 180/π to convert to degrees, or use the formula radians * (180 / Math.PI) in JavaScript.
How to raise a number to a power in JavaScript
Use Math.pow() or the exponentiation operator (**) to raise numbers to powers efficiently in JavaScript.
How to get the square root of a number in JavaScript
Use Math.sqrt() to calculate the square root of a number efficiently in JavaScript for mathematical computations.
How to get the absolute value of a number in JavaScript
Use Math.abs() to get the absolute value of a number, removing the sign and returning the magnitude in JavaScript.
How to calculate the factorial of a number in JavaScript
Use recursion or iteration to calculate the factorial of a number efficiently in JavaScript for mathematical computations.
How to format a number as currency in JavaScript
Use Intl.NumberFormat to format numbers as currency with proper locale and symbol handling in JavaScript.
How to convert a number to a string in JavaScript
Use toString() method or String() constructor to convert numbers to string format efficiently in JavaScript.
How to check if a number is odd in JavaScript
Use the modulo operator (%) to check if a number is odd by testing if it has a remainder when divided by 2 in JavaScript.
How to check if a number is even in JavaScript
Use the modulo operator (%) to check if a number is even by testing if it is divisible by 2 in JavaScript.
How to check if a value is NaN in JavaScript
Use Number.isNaN() to reliably check if a value is NaN (Not a Number) in JavaScript with proper type safety.
How to convert a string to a number in JavaScript
Use Number() constructor or unary plus operator to convert strings to numbers efficiently in JavaScript.
How to generate a random integer in JavaScript
Use Math.floor() with Math.random() to generate random whole numbers within a specified range in JavaScript.
