27/12/2025
JavaScript Methods Every Developer Should Master
➤ Elevate your coding skills with these must-know JavaScript methods
↳ Handle strings, arrays, math, dates, JSON, and promises.
↳ These tools are your ticket to cleaner, more efficient code.
➤ String Methods
↳ slice(start, end) – Extract a portion of a string.
↳ replace(searchValue, newValue) – Replace specified text.
↳ toLowerCase() & toUpperCase() – Change case.
↳ includes(searchString) – Check for a substring.
↳ trim() – Remove whitespace.
↳ split(delimiter) – Convert a string into an array.
➤ Array Methods
↳ map(callback) – Transform array elements.
↳ filter(callback) – Filter elements based on conditions.
↳ forEach(callback) – Iterate over array elements.
↳ find(callback) – Find the first matching element.
↳ some(callback) & every(callback) – Test conditions across elements.
➤ Math Methods
↳ Math.round(value) – Round to the nearest integer.
↳ Math.floor(value) & Math.ceil(value) – Round down or up.
↳ Math.random() – Generate random numbers.
↳ Math.max(...numbers) & Math.min(...numbers) – Find extremes.
➤ Date Methods
↳ new Date() – Create a new date object.
↳ getFullYear() – Retrieve the year.
↳ getMonth() – Get the month (0-11).
↳ toLocaleDateString() – Format as a readable string.
↳ getTime() – Get a timestamp in milliseconds.
➤ JSON Methods
↳ JSON.stringify(object) – Convert an object to a string.
↳ JSON.parse(jsonString) – Turn a string back into an object.
➤ Promise Methods
↳ Promise.all([promises]) – Resolve multiple promises together.
↳ Promise.race([promises]) – Resolve once the fastest promise resolves.
↳ then(callback) – Handle success.
↳ catch(callback) – Manage errors.
↳ finally(callback) – Execute cleanup code.
➤ Document attached below
↳ Credits - Respective Owners
