Top Tweets for #teachingJs
An easy way of clearing or truncating an array without reassigning it is by changing its length property value.
#javascript #js #teachingJS #hints #tips #code #frontend #code
Use of eval or the Function constructor are expensive operations as each time they are called script engine must convert source code to executable code.
#javascript #tips #hints #teachingJS #ecmaScript #FrontEnd #js #code
Using switch/case is faster when there are more than 2 cases, and it is more elegant (better organized code). Avoid using it when you have more than 10 cases.
#javascript #ecmaScript #teachingJs #tips #tricks #js #information #learntocode
sessionStorage is similar to localStorage; the only difference is while data stored in localStorage has no expiration time, data stored in sessionStorage gets cleared when the page session ends.
#javascript #property #storage #teachingJS #tips #hints #code #clientSide #js
Don’t use delete to remove an item from array, use splice instead of using delete to delete an item from an array. Using delete replaces the item with undefined instead of the removing it from the array.
#teachingJS #tips #javascript #ecmaScript #clientSide #code
The == (or !=) operator performs an automatic type conversion if needed. The === (or !==) operator will not perform any conversion. It compares the value and the type, which could be considered faster than ==.
#teachingJS #tips #javascript #ecmaScript #FrontEnd #code
Asynchronous (async) code is code that is scheduled to run at a later time after some event, delay or response. It can appear a bunch of different ways in JavaScript code, and it’s important to be able to interpret them.
#teachingJs #ecmaScript #code #javascript
You can do both functional and oops using JavaScript. From ES6 onwards there are keywords like class extend etc for proper syntactical object oriented support.
#javascript #js #teachingJs #oops #ecmaScript #didyouknow
JavaScript was created in 10 days only and when released it used to cover a very small portion of a proper programming language.
#teachingJS #javascript #js #ecmaScript #coding #development #didyouknow
When you learn a new concept, make sure to try it out, play with it, get comfortable with it, and even combine it with other concepts.
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when JavaScript is asked to compare values of differing data types, it first “coerces” them into a common data type. False, zero, null, undefined, empty strings and NaN all end up becoming false — not permanently, just for the given expression.
#teachingJS #javascript #sharing
Sorting a whole array is a very inefficient method if you only want to find the highest (or lowest) value.
#javascript #teachingJS #FrontEnd #optimization #code #ecmaScript
All javascript object have a toString() method.
#javascript #ecmaScript #FrontEnd #clientside #webdevelopment #teachingJS #code
JavaScript store dates as number of milliseconds.
#javascript #js #teachingJS #date #object #FrontEnd #development #code
Date objects are static. The computer time is ticking, but the date objects are not
#teachingJS #javascript #ecmaScript #frontend #development #code
JavaScript counts months from 0 to 11, January is 0. December is 11.
#javascript #ecmaScript #teachingJS #funfact #dateobject
Functions are first-class objects, because they can have properties and methods just like any other object. What distinguishes them from other objects is that functions can be called. In brief, they are Function objects.
#teachingJS #Js #javascript #ecmaScript
The = operator assigns values. It’s used for setting the value of variables.
Example:
var dinner = "Jamaican Rice and Peas paired with Strew Chicken ";
#javascript #ecmaScript #teachingJS #frontEnd #webdevelopment
The + operator can also concatenate strings, which is another way of saying it can add them together.
Example:
"news" + "paper";
Result:
"newspaper"
This is known as Concatenation.
#teachingJS #ecmaScript #frontEnd #clientSide
JavaScript expressions follow an order of operations, so even though + is written first in the following example, the multiplication happens first between the last two numbers and *.
Example:
1 + 500 * 5;
Result:
501
#teachingJS #javascript #ecmaScript #FrontEnd #clientside
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