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JAVASCRIPT
| Term | Definition |
|---|---|
| - string, number, boolean, array, object, null, undefined | |
| - event capturing, Target phase, event bubbling, event delegation | |
| - event.target, event.target.value, event.target.closest, e.target.className, e.target.id, e.target.innerHTML | |
| - event.stopPropagation, event.stopImmediatePropagation, event.preventDefault(), | |
| - elem.addEventListener(..., true) | |
| - onchange, onclick, onmouseover, onload, onkeydown | |
| - Abortcontroller and symbol; cancelling the api request | |
| - Throttling and debouncing | |
| - asynchronous programming, callback and promises, callback hell, error callback | |
| - closure, hoisting | |
| - function, arguments.length, anonymous function, IIFE (use of it in singleton in vanilla js); | |
| - lexical, functional and block scope | |
| - event queue, event-loop, call stack, single threaded, macro-tasks(apicalls, setTimeout, mouse-event, script tag), micro-tasks(process.nextTick, promises - higher priority), | |
| - type=module in script tag (import/export, deferred execution, module scoped variables) | |
| - call, bind, apply (how .apply is used when num of arguments passed is uncertain and you have to write a wrapper function) | |
| - `func.apply(this, [...args, callback]);` | |
| - method chaining, currying, | |
| - generators, yield | |
| - static type checking at compile time | |
| - TypeScript decorators are functions that can be used to modify or add metadata to classes, methods, or properties. | |
| - Generics interface e.g interface myInterface<T> | |
| - readonly : The readonly modifier can be used to create arrays that cannot be modified after initialization. | |
| - keyof : obtain the union type of all possible property names of a given type. | |
| - Declaration files (.d.ts) provide type information for existing JavaScript code, allowing TypeScript to understand the types used in external libraries. Definition files are typically generated by tools like DefinitelyTyped. | |
| - Enums, and what are "const enums" | |
| - "strict mode" in TypeScript : ncludes options like strictNullChecks, strictFunctionTypes | |
| - "conditional imports" in TypeScript | |
| - document.querySelector(".className"), | |
| - document.querySelector(" | idName"), |
| - document.getElementById('id_name'), | |
| - document.getElementsByClassName('className') | |
| - document.cookie | |
| - `Ecmascript` | |
| - ES5(2009) - useStrict, JSON.stringify, JSON.parse, | |
| - ES6(2015) - Promises, let, const, template literal, arrow function (self = this), class, super(),constructor,extends, rest and spread. default param, destructuring,generators (function*) | |
| - ES7(2017) - async await and equivalent promise conversion | |
| - `Object` | |
| - Object.keys, Object.values, for(const of ) | |
| - Object.freeze(), Object.seal(), Object.isFrozen(), Object.isSeal() | |
| - Object.prototype.hasOwnProperty | |
| - Object.create() | |
| - Prototype, constructor, __proto__, Object.create(), prototype.constructor (function constructor), instanceof | |
| - object.hasOwnProperty(property) | |
| - `Array` | |
| - arr.sort((a,b)=> a-b); | |
| - array.filter().map().join("") | |
| - promise.all(), promise.race(), .resolve(), .reject(), callback | |
| - state of promise : pending, fulfilled, rejected | |
| - new Promise((reolve, reject)=> {}) | |
| - Difference between myPromise.then(result => {}, err => {}) and myPromise.then(result => {}).catch(err => {}); | |
| - ways of creating an object in JS | |
| - data types in JS - string, number, boolean, object, array, null, undefined | |
| - `string.reverse().split("").includes().trim()` | |
| - AJax calls : `XMLHttpRequest` and `fetch API` (modern version) | |
| - higher order functions (e.g map, filter, foreach etc.) | |
| - JSONP (JSON with Padding) - hack for handling cors issue | |
| - Host objects(provided by browser or run time env like node.js) vs native objects (provided by language) | |
| - Debugging | |
| - chrome devtools | |
| - debugger statement | |
| - console.log | |
| - CommonJS abd Asynchronous Module Definition (AMD) | |
| - `DOMContentLoaded` and `load` event | |
| - `UA string` (user agent string) | |
| - `Feature Detection` |
Created by:
user-2034996