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JavaScript: Difference between revisions
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// then the first element will be your accumulator | // then the first element will be your accumulator | ||
// I.e. the first call to your function will be (arr[0], arr[1]) | // I.e. the first call to your function will be (arr[0], arr[1]) | ||
arr.reduce((acc, x) => acc + x, 0); //6 | arr.reduce((acc, x) => acc + x, 0); // 6 | ||
</syntaxhighlight> | </syntaxhighlight> | ||
| Line 28: | Line 28: | ||
console.log(match[1], match[2]); | console.log(match[1], match[2]); | ||
console.table(match); | console.table(match); | ||
</syntaxhighlight> | |||
===Classes=== | |||
Traditionally, classes are done using functions in JavaScript.<br> | |||
{{hidden | Traditional JS Classes | | |||
<syntaxhighlight lang="javascript"> | |||
function Rectangle(height, width) { | |||
this.height = height; | |||
this.width = width; | |||
} | |||
// To extend some Shape class | |||
Rectangle.prototype = Object.create(Shape.prototype); | |||
// To add to the prototype | |||
Object.assign(Rectangle.prototype, { | |||
getSize: function() { | |||
return this.height * this.width; | |||
} | |||
}); | |||
</syntaxhighlight> | |||
}} | |||
[https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Classes Mozilla Reference]<br> | |||
ES2015 adds syntax for classes in JavaScript.<br> | |||
<syntaxhighlight lang="javascript"> | |||
class Rectangle extends Shape { | |||
constructor(height, width) { | |||
this.height = height; | |||
this.width = width; | |||
} | |||
getSize() { | |||
return this.height * this.width; | |||
} | |||
} | |||
</syntaxhighlight> | </syntaxhighlight> | ||
==Compilation== | ==Compilation== | ||
===Webpack=== | |||
===Babel=== | |||
==Websockets== | |||
How to use Websockets | |||
===Getting Started=== | |||
<syntaxhighlight lang="javascript"> | |||
let ws = new WebSocket(this.SERVER_URL); | |||
ws.onopen = function(event) { | |||
console.log("Websocket opened"); | |||
ws.send("Hi"); | |||
}; | |||
ws.onmessage = function(event) { | |||
console.log("message received"); | |||
console.log(event.data); | |||
}; | |||
ws.onclose = function() { | |||
console.log("WS Closed"); | |||
}; | |||
</syntaxhighlight> | |||
==Modules== | ==Modules== | ||
===Getting Started=== | |||
[https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Modules MDN Guide to Modules]<br> | |||
<syntaxhighlight lang="javascript"> | |||
</syntaxhighlight> | |||