//run this in your console
for (var i = 0; i <= 3; i++) {
setTimeout(function(){
console.log(i);
}, 0);
}
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// this function takes in any parameter and can tell if it's "falsy" or not. | |
// falsy means it's either false, 0, null, undefined, NaN, or an empty string/array/object | |
// see the test cases at the bottom for a clearer picture | |
function isFalsy(item) { | |
try { | |
if ( | |
!item // handles most, like false, 0, null, etc | |
|| ( | |
typeof item == "object" && ( |
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// under Google Chrome 36 | |
Object.prototype.toString.call([]) | |
// "[object Array]" | |
Object.prototype.toString.call(function(){}) | |
// "[object Function]" | |
Object.prototype.toString.call({}) | |
// "[object Object]" | |
Object.prototype.toString.call(null) | |
// "[object Null]" |
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/*global console: true */ | |
"use strict"; | |
/* | |
A vector type | |
Write a constructor Vector that represents a vector in two-dimensional | |
space. It takes x and y parameters (numbers), which it should save to | |
properties of the same name. | |
Give the Vector prototype two methods, plus and minus, that take another vector as a parameter and return a new vector that has the sum | |
or difference of the two vectors’ (the one in this and the parameter) x | |
and y values. |
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var Graph = function() { | |
this.nodes = {}; | |
this.edges = {}; | |
}; | |
Graph.prototype.addNode = function(node) { | |
this.nodes[node] = node; | |
}; | |
Graph.prototype.contains = function(node) { |
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body { | |
font-family: 'HelveticaNeue-UltraLight', 'Helvetica Neue UltraLight', 'Helvetica Neue', Arial, Helvetica, sans-serif; | |
font-weight: 100; | |
letter-spacing: 1px; | |
} |
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<!DOCTYPE html> | |
<html lang="en"> | |
<head> | |
<meta charset="UTF-8"> | |
<meta http-equiv="X-UA-Compatible" content="IE=edge"> | |
<meta name="viewport" content="width=device-width, initial-scale=1, user-scalable=no"> | |
<link rel="stylesheet" href="css/bootstrap.min.css"> | |
<link rel="stylesheet" href="css/style.css"> | |
<!--Picturefill--> |