Picture

JavaScript Tips @javascript_tips

Tips and tricks to make the most of JavaScript and avoid gotchas. San Francisco, CA Joined May 2016
  • Tweets
    37
  • Followers
    347
  • Following
    336
  • Likes
    199
javascript_tips Profile Picture

JavaScript Tips @javascript_tips

9 years ago

Arrow functions are not yet supported in Safari, IE and Opera Mini. #javascript #es6 #tip caniuse.com/#feat=arrow-fu…

javascript_tips Profile Picture

JavaScript Tips @javascript_tips

9 years ago

// ES5 var posNums = nums.filter(function (x) { return x > 0; }); // #ES6 var posNums = nums.filter(x => x > 0); #javascript #tip

javascript_tips Profile Picture

JavaScript Tips @javascript_tips

9 years ago

#ES6 arrow functions do not have their own 'this'. The value of this inside an arrow function is always inherited from the enclosing scope.

JavaScript Tips retweeted
ericelliott_ Profile Picture

Eric Elliott @ericelliott_

9 years ago

Code is temporary. It exists while it is useful. If code is replaced by better code, good! If code can be deleted, celebrate! #JavaScript

javascript_tips Profile Picture

JavaScript Tips @javascript_tips

9 years ago

Shorthand for #es6 arrow function with single argument: var f = x => { return x*x; }; // equivalent to var f = (x) => { return x*x; };

javascript_tips Profile Picture

JavaScript Tips @javascript_tips

9 years ago

Shorthand for #es6 arrow function with single return statement: var f = (x) => x*x; // equivalent to var f = (x) => { return x*x; };

javascript_tips Profile Picture

JavaScript Tips @javascript_tips

9 years ago

ES6 arrow functions: var normalFunc = function(x) { return x * x; }; var arrowFunc = (x) => { return x*x; }; #javascript #tips

javascript_tips Profile Picture

JavaScript Tips @javascript_tips

9 years ago

#javascript 'new' keyword: function A() { this.x = 1; this.y = 2; } var a1 = new A(); var a2 = new A(); a1.x++; a1.x; // 2 a2.x; // 1

javascript_tips Profile Picture

JavaScript Tips @javascript_tips

9 years ago

Usage of the 'arguments' local variable: function foo() { console.log(arguments); } foo(1, 2, 3, 4); // [1, 2, 3, 4] #javascript #tip

javascript_tips Profile Picture

JavaScript Tips @javascript_tips

9 years ago

Use #es6 in your javascript code today with @babeljs! hacks.mozilla.org/2015/06/es6-in…

javascript_tips Profile Picture

JavaScript Tips @javascript_tips

9 years ago

Convert CSV to array: var str = "apple, peach, orange"; var fruitsArray = str.split(","); // ['apple', 'peach', 'orange'] #javascript #tip

javascript_tips Profile Picture

JavaScript Tips @javascript_tips

9 years ago

#JavaScript array to csv: var fruits = ['apple', 'peaches', 'oranges']; var str = fruits.valueOf(); // apple,peaches,oranges #js #tips

javascript_tips Profile Picture

JavaScript Tips @javascript_tips

9 years ago

Remove duplicates from array: var deduped = [ 1, 1, 'a', 'a'].filter(function (x, i, arr) { return arr.indexOf(x) === i; }); // [1, 'a']

javascript_tips Profile Picture

JavaScript Tips @javascript_tips

9 years ago

Flattening an array : var myArray = [[1, 2], [], [3]]; var flatArray = [].concat.apply([], myArray); // flatArray is [1, 2, 3] #javascript

javascript_tips Profile Picture

JavaScript Tips @javascript_tips

9 years ago

Getting a UNIX timestamp in #JavaScript: var dateTime = Date.now(); var timestamp = Math.floor(dateTime / 1000); #tips #js

javascript_tips Profile Picture

JavaScript Tips @javascript_tips

9 years ago

To see a function's code, concatenate it with the empty string : console.log(funcVariable + ''); #javascript #tips

javascript_tips Profile Picture

JavaScript Tips @javascript_tips

9 years ago

The && operator first evaluates the expression on the left. If falsy, false is returned; it does not bother to evaluate the right operand.

javascript_tips Profile Picture

JavaScript Tips @javascript_tips

9 years ago

JavaScript Falsy Values: null, false, 0 undefined, NaN, and “” (this last item is an empty string). #javascript #tips

javascript_tips Profile Picture

JavaScript Tips @javascript_tips

9 years ago

Infinity, which is a special number like NaN, is truthy; it is not falsy, while NaN is falsy. #javascript #tips

javascript_tips Profile Picture

JavaScript Tips @javascript_tips

9 years ago

Calculate max/min in an array: var arr = [1, 2, 3, 4]; Math.max.apply(null, arr) // 4 Math.min.apply(null, arr) // 1 #javascript #tips

Trends for United States

Qatar
165 B posts
Doha
115 B posts
Haru Urara
113 B posts
bluefin
Nepal
715 B posts
ariana
133 B posts
#EternalSunshineTour
#tuesdayvibe
4.726 posts
Twitter Give
507 B posts
Good Tuesday
32,6 B posts
GiveRep
125 B posts
#AppleEvent
12,8 B posts
#ReineMEPtember2025
17,2 B posts
Taco Tuesday
9.628 posts
SeatGeek
1.829 posts
Ticketmaster
13,8 B posts
Van Jones
8.319 posts
#Hamas
10,8 B posts
Ange
56,7 B posts
$CWD
3.654 posts

You might like

lead eng @disneyplus. building https://t.co/1CTL2kOd3Y sorry not raising $15 million
montano
@lucas_montano
60K Followers
ABS-CBN News Correspondent. Anchor, The World Tonight.
Pia Gutierrez
@pia_gutierrez
43K Followers
platform @reachfund, ex-managing editor @edsurge. my tweets are short i know but they’re not yours, they are my own.
Tony Wan
@tonywan
5K Followers
🇺🇦 Support https://t.co/viuzz396kB
Mykhaïlo Golub
@golub
44K Followers
HIRECLOUT is a technology recruiting & consulting firm focused on building relationships that deliver results. Interested? Check out our website!
HIRECLOUT
@HIRECLOUT
935 Followers
Women’s health writer. Author of The Complete Guide to IVF and Precious Babies. Co/founder @thefertalliance
kate brian
@katebrian
4K Followers
Instagram: @kairinhio
Kairinhio
@KairJazael
407 Followers
Rheumatologist, Hammersmith Hospital, Imperial College London Vasculitis Centre.
Taryn Youngstein
@TYoungstein
5K Followers
Scala Developer Advocate @ VirtusLab, mostly Scala. Opinions my own. https://t.co/gyghe5P3bx https://t.co/rFEeRYyfKX
Łukasz Biały
@lukasz_bialy
866 Followers
President Smiles😄😉😊🤣😂 The Love of Jesus changes and sets you free!
Quintis
@quintisjacobs
2K Followers
Daddio, 👨🏻‍💻Dev, 🏈 fan, Indy, and gamer at heart. Twitch streamer and rockstar extraordinaire https://t.co/drvea7VXca
enigmattic
@matt_enigmatic
223 Followers