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JavaScript Tips @javascript_tips

Tips and tricks to make the most of JavaScript and avoid gotchas. San Francisco, CA Joined May 2016
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JavaScript Tips @javascript_tips

10 years ago

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

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JavaScript Tips @javascript_tips

10 years ago

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

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JavaScript Tips @javascript_tips

10 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.

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Eric Elliott @ericelliott_

10 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

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JavaScript Tips @javascript_tips

10 years ago

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

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JavaScript Tips @javascript_tips

10 years ago

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

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JavaScript Tips @javascript_tips

10 years ago

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

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JavaScript Tips @javascript_tips

10 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

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JavaScript Tips @javascript_tips

10 years ago

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

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JavaScript Tips @javascript_tips

10 years ago

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

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JavaScript Tips @javascript_tips

10 years ago

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

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JavaScript Tips @javascript_tips

10 years ago

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

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JavaScript Tips @javascript_tips

10 years ago

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

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JavaScript Tips @javascript_tips

10 years ago

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

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JavaScript Tips @javascript_tips

10 years ago

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

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JavaScript Tips @javascript_tips

10 years ago

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

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JavaScript Tips @javascript_tips

10 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.

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JavaScript Tips @javascript_tips

10 years ago

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

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JavaScript Tips @javascript_tips

10 years ago

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

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JavaScript Tips @javascript_tips

10 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

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