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Resursion 2
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license: mit |
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Learn more about bidirectional Unicode characters
<!DOCTYPE html> | |
<head> | |
<meta charset="utf-8"> | |
<script src="https://d3js.org/d3.v4.min.js"></script> | |
<style> | |
body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; } | |
</style> | |
</head> | |
<body> | |
<script> | |
// Feel free to change or delete any of the code you see in this editor! | |
var svg = d3.select("body").append("svg") | |
.attr("width", 960) | |
.attr("height", 500) | |
svg.append("text") | |
.text("Recursive Crusade") | |
.attr("id","title") | |
.attr("y", 50) | |
.attr("x", 20) | |
.attr("font-size", 28) | |
.attr("font-weight", 500) | |
.attr("fill", "teal") | |
.attr("font-family", "monospace") | |
svg.append("text") | |
.text("") | |
.attr("id", "result") | |
.attr("y", 90) | |
.attr("x", 30) | |
.attr("font-size", 20) | |
.attr("font-family", "monospace") | |
svg.append("text") | |
.text("...") | |
.attr("id", "recursion") | |
.attr("y", 120) | |
.attr("x", 50) | |
.attr("font-size", 20) | |
.attr("font-family", "monospace") | |
function removeDuplicateDates(arr, equals) { | |
var originalArr = arr.slice(0); | |
var i, len, j, val; | |
arr.length = 0; | |
for (i = 0, len = originalArr.length; i < len; ++i) { | |
val = originalArr[i]; | |
if (!arr.some(function(item) { return thingsEqual(item, val); })) { | |
arr.push(val); | |
} | |
} | |
} | |
function thingsEqual(thing1, thing2) { | |
const date1 = new Date(thing1.created_on); | |
const date2 = new Date(thing2.created_on); | |
return date1.getDate() === date2.getDate() | |
&& date1.getMonth() === date1.getMonth() | |
&& date1.getFullYear() === date1.getFullYear(); | |
} | |
const things = [ | |
{created_on:"Fri, 06 Dec 2019 02:31:20 GMT",name:"sword"}, | |
{created_on:"Fri, 07 Dec 2019 02:31:20 GMT",name:"shield"}, | |
{created_on:"Fri, 08 Dec 2019 02:31:20 GMT",name:"mace"}, | |
{created_on:"Fri, 08 Dec 2019 02:31:20 GMT",name:"mace"} | |
]; | |
removeDuplicateDates(things, thingsEqual); | |
const updateResult = ( id, result, color) => { | |
d3.select(`#${id}`).text(result) | |
if (color){ | |
d3.select(`#${id}`).attr("fill", color) | |
} | |
} | |
const str = things.map( thing => (thing.name)) | |
updateResult("result", String(str)) | |
// Resursion practice... | |
const phrase = "As the cleric healed the wounded...".split(""); | |
let sentence = ""; | |
function walkPhrase(phrase, n) { | |
if (n === 0) { | |
return; | |
} else { | |
return setTimeout( () => { | |
const idx = phrase.length - n; | |
const letter = phrase[idx]; | |
sentence = sentence + letter; | |
const color = n % 2 === 0 ? "pink" : "red"; | |
updateResult("recursion", sentence, color); | |
return walkPhrase(phrase, n - 1) | |
}, 200) | |
} | |
} | |
walkPhrase(phrase, phrase.length) | |
/* | |
https://javascript.info/recursion | |
https://javascript.info/currying-partials | |
*/ | |
</script> | |
</body> |
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