What I'm doing right now, is deleting any diff that doesn't contain the string, and if the diff's dictionary is empty, then i try to delete the map.
the issue here is that, i can't delete a map with data.delete(map) for some reasons (no errors in console) and any piece of code located after that deletion in the if statement won't run.
here is the code in question:
var data = new Map({"593620 Linked Horizon - Shinzou o Sasageyo! [TV Size]": {"difficulties": {"Titan": 86813}}, "859608 LiSA - ADAMAS (TV Size)": {"difficulties": {"Kibbleru's Blue Rose": 899}},"940746 CHiCO with HoneyWorks - Kimi ga Sora Koso Kanashikere": {"difficulties": {"Taeyang's Extra": 72321}}});
var string = "titan";
Array.from(data.keys()).forEach(function(map) {
if (!(map.toLowerCase().indexOf(string.toLowerCase()) >=0)) {
if (document.getElementById("diff_search_box").checked) {
Array.from(data.get(map).get("difficulties").keys()).forEach(function(diff) {
if (!(diff.toLowerCase().indexOf(string) >= 0)) {
data.get(map).get("difficulties").delete(diff)
}
})
if (Array.from(data.get(map).get("difficulties").keys()).length = 0) {
data.delete(map)
}
}
}
})
in this situation, I'm supposed to get a dictionary such as:
{
"593620 Linked Horizon - Shinzou o Sasageyo! [TV Size]": {
"difficulties": {"Titan": 86813}
}
}
Huge number of problems with this code. My recommendation is don't write so much code without running it to make sure it works first. Write small pieces at a time and run it as you go making sure everything works along the way.
Issue number one is you cannot initialize a map with an object like that. The Map must be initialized with an array of arrays that are each two elements long, each containing the key value pairs for the map. You can fix this by wrapping the object in Object.entries() as that will return the key vale pairs for the object.
Second problem is titan is a string so it should be "titan".
Number three, you're calling .get on an object in the line data.get(map).get("difficulties"). Objects do not have .get, you have to use brackets or dot syntax: data.get(map).difficulties or data.get(map).difficulties.
Fourth, I think you don't actually want to delete the data from the map. If you did, when the user changes the search text the old data would still be gone.
Why are you using map anyways? you can simply use a normal object.
Just do this if you must use maps:
var data = new Map(Object.entries({
"593620 Linked Horizon - Shinzou o Sasageyo! [TV Size]": {
"difficulties": {"Titan": 86813}
},
"859608 LiSA - ADAMAS (TV Size)": {
"difficulties": {"Kibbleru's Blue Rose": 899}
},
"940746 CHiCO with HoneyWorks - Kimi ga Sora Koso Kanashikere": {
"difficulties": {"Taeyang's Extra": 72321}
}
}));
var string = 'titan';
function search(s) {
var r = {};
for( const [key, value] of data ) {
for( const diffKey in value.difficulties ) {
if(diffKey.toLowerCase().indexOf(string) != -1)
r[key] = value;
}
}
return new Map(Object.entries(r));
}
With this function, you can do search(string) and it will return you the map that you were wanting originally.
Mainly you should writing a bunch of code without running anything.
Map needs an iterable like an array passed to it such as:
new Map([['Key 1', 'Value 1'], ['Key 1', 'Value 1']])
You can't pass an object literal to it but you can easily use Object.entries() to extract the needed array from your object.
Then you can use Map.prototype.forEach() to loop over all the Map entries
var data = {"593620 Linked Horizon - Shinzou o Sasageyo! [TV Size]": {"difficulties": {"Titan": 86813}}, "859608 LiSA - ADAMAS (TV Size)": {"difficulties": {"Kibbleru's Blue Rose": 899}},"940746 CHiCO with HoneyWorks - Kimi ga Sora Koso Kanashikere": {"difficulties": {"Taeyang's Extra": 72321}}};
const map = new Map(Object.entries(data));
map.forEach((value, key) =>{
const {difficulties} = value;
console.log('Map key:', key.toLowerCase());
// if(someCondition){
// map.delete(key)
// }
Object.entries(difficulties).forEach(([k,v])=>{
console.log('Diff key:', k, ' Diff value:', v)
// if(k.toLowerCase().includes('titan')){
// delete difficulties[key];
// }
})
console.log('*****************************')
})
surprising to see none of the previous answer saw that, another person on a discord server i do support for software stuff on pointed out the last if condition and the fact it's missing a = so it appear as
if (Array.from(data.get(map).get("difficulties").keys()).length == 0) {
// was = before, == now
data.delete(map)
}
so now i indeed obtain a data dictionary with only 1 element containing the map which also have the difficulty that's contained in the specified string.
Related
I'm parsing an order feed to identify duplicate items bought and group them with a quantity for upload. However, when I try to map the resulting array, it's showing [object Object], which makes me think something's converting the return into an object rather than an array.
The function is as follows:
function compressedOrder (original) {
var compressed = [];
// make a copy of the input array
// first loop goes over every element
for (var i = 0; i < original.length; i++) {
var myCount = 1;
var a = new Object();
// loop over every element in the copy and see if it's the same
for (var w = i+1; w < original.length; w++) {
if (original[w] && original[i]) {
if (original[i].sku == original[w].sku) {
// increase amount of times duplicate is found
myCount++;
delete original[w];
}
}
}
if (original[i]) {
a.sku = original[i].sku;
a.price = original[i].price;
a.qtty = myCount;
compressed.push(a);
}
}
return compressed;
}
And the JS code calling that function is:
contents: compressedOrder(item.lineItems).map(indiv => ({
"id": indiv.sku,
"price": indiv.price,
"quantity": indiv.qtty
}))
The result is:
contents: [ [Object], [Object], [Object], [Object] ]
When I JSON.stringify() the output, I can see that it's pulling the correct info from the function, but I can't figure out how to get the calling function to pull it as an array that can then be mapped rather than as an object.
The correct output, which sits within a much larger feed that gets uploaded, should look like this:
contents:
[{"id":"sku1","price":17.50,"quantity":2},{"id":"sku2","price":27.30,"quantity":3}]
{It's probably something dead simple and obvious, but I've been breaking my head over this (much larger) programme till 4am this morning, so my head's probably not in the right place}
Turns out the code was correct all along, but I was running into a limitation of the console itself. I was able to verify this by simply working with the hard-coded values, and then querying the nested array separately.
Thanks anyway for your help and input everyone.
contents: compressedOrder(item.lineItems).map(indiv => ({
"id": indiv.sku,
"price": indiv.price,
"quantity": indiv.qtty
}))
In the code above the compressedOrder fucntion returns an array of objects where each object has sku, price and qtty attribute.
Further you are using a map on this array and returning an object again which has attributes id, price and quantity.
What do you expect from this.
Not sure what exactly solution you need but I've read your question and the comments, It looks like you need array of arrays as response.
So If I've understood your requirement correctly and you could use lodash then following piece of code might help you:
const _ = require('lodash');
const resp = [{key1:"value1"}, {key2:"value2"}].map(t => _.pairs(t));
console.log(resp);
P.S. It is assumed that compressedOrder response looks like array of objects.
I have a multidimensional array which contains coordinates extracted from a back-end call, this is a screenshot of the structure:
I would like to swap those coordinates but I cannot know how to handle that. Thanks.
Many ways to accomplish what you're looking for. One approach is to loop through the structure until you reach the arrays you want to manipulate. In the snippet, I decided to make a function that took the original data and returns a new object. To 'swap' the contents of the arrays, I did a .splice(0) to make a copy of the array, then called .reverse() on it to switch the order.
The main challenge is working through the data structure - some fairly intuitive levels to the current structure you have (a coordinates object that contains a node called coordinates that is array - just a little confusing)
var dataFromTheServer = {
content: [
{
coordinates: {
coordinates: [
[17.25756,31.19192],
[15.1821, 40.87555],
[33.78433, 18.59314],
[17.25756,31.19192]
]
}
}
]
}
function swapEm(data){
var response = {};
if(data && data.content){
response.content = [{coordinates:{coordinates:[]}}];
for(var item in data.content){
if(data.content[item] && data.content[item].coordinates && data.content[item].coordinates.coordinates){
for(var coord in data.content[item].coordinates.coordinates){
response.content[0].coordinates.coordinates[coord] = data.content[item].coordinates.coordinates[coord].splice(0).reverse()
}
}
}
}
return response;
}
console.log(dataFromTheServer);
console.log(swapEm(dataFromTheServer))
How could I rewrite this code to object javascript. Since Array usage is prohibed, I can only use objects here. Insted of pushing values to array, I would like to push this values into objects.
var container = [];
document.addEventListener("submit", function(e){
e.preventDefault();
});
window.addEventListener("load",function(){
var submit = document.getElementsByClassName("btn-primary");
submit[0].addEventListener("click",add,false);
document.getElementById("pobrisi").addEventListener("click",deleteAll,false);
var dateElement = document.getElementById('datum');
dateElement.valueAsDate = new Date();
var today = new Date();
var dd = today.getDate();
var mm = today.getMonth()+1;
var yyyy = today.getFullYear();
if(dd<10){
dd='0'+dd
}
if(mm<10){
mm='0'+mm
}
today = yyyy+'-'+mm+'-'+dd;
dateElement.setAttribute("min",today);
});
function add() {
var title = document.getElementById("title").value;
var type = document.getElementById("type").value;
var datum = document.getElementById("datum").value.split("-");
datum = datum[2]+". "+datum[1]+". "+datum[0];
var data = new Book(title,type,datum);
container.push(data.add());
display();
}
function display(data) {
var destination = document.getElementById("list");
var html = "";
for(var i =0;i <container.length; i++) {
html +="<li>"+container[i]+"</li>";
}
destination.innerHTML = html;
}
function deleteAll(){
container=[];
document.getElementById("list").innerHTML="";
}
Wondering if is possible to write this code whitout any array usage.
initial remarks
The problem here, in my estimation, is that you haven't learned the fundamentals of data abstraction yet. If you don't know how to implement an array, you probably shouldn't be depending on one quite yet. Objects and Arrays are so widespread because they're so commonly useful. However, if you don't know what a specific data type is affording you (ie, what convenience does it provide?), then it's probable you will be misusing the type
If you take the code here but techniques like this weren't covered in your class, it will be obvious that you received help from an outside source. Assuming the teacher has a curriculum organized in a sane fashion, you should be able to solve problems based on the material you've already covered.
Based on your code, it's evident you really have tried much, but why do you think that people here will come up with an answer that your teacher will accept? How are we supposed to know what you can use?
a fun exercise nonetheless
OK, so (we think) we need an Array, but let's pretend Arrays don't exist. If we could get this code working below, we might not exactly have an Array, but we'd have something that works like an array.
Most importantly, if we could get this code working below, we'd know what it takes to make a data type that can hold a dynamic number of values. Only then can we begin to truly appreciate what Array is doing for us.
// make a list
let l = list(1) // (1)
// push an item on the end
l = push(l, 2) // (1 2)
// push another item on the end
l = push(l, 3) // (1 2 3)
// display each item of the list
listeach(l, function (x) {
console.log(x)
})
// should output
// 1
// 2
// 3
runnable demo
All we have to do is make that bit of code (above) work without using any arrays. I'll restrict myself even further and only use functions, if/else, and equality test ===. I see these things in your code, so I'm assuming it's OK for me to use them too.
But am I supposed to believe your teacher would let you write code like this? It works, of course, but I don't think it brings you any closer to your answer
var empty = function () {}
function isEmpty (x) {
return x === empty
}
function pair (x,y) {
return function (p) {
return p(x,y)
}
}
function head (p) {
return p(function (x,y) {
return x
})
}
function tail (p) {
return p(function (x,y) {
return y
})
}
function push (l, x) {
if (isEmpty(l))
return list(x)
else
return pair(head(l), push(tail(l), x))
}
function list (x) {
return pair(x, empty)
}
function listeach (l, f) {
if (isEmpty(l))
return null
else
(f(head(l)), listeach(tail(l), f))
}
// make a list
let l = list(1) // (1)
// push an item on the end
l = push(l, 2) // (1 2)
// push another item on the end
l = push(l, 3) // (1 2 3)
// display each item of the list
listeach(l, function (x) {
console.log(x)
})
closing remarks
It appears as tho you can use an Object in lieu of an Array. The accepted answer (at this time) shows a very narrow understanding of how an object could be used to solve your problem. After this contrived demonstration, are you confident that you are using Objects properly and effectively?
Do you know how to implement an object? Could you fulfill this contract (below)? What I mean by that, is could you write the functions object, set, and get such that the following expressions evaluated to their expected result?
In case it's not obvious, you're not allowed to use Object to make it happen. The whole point of the exercise is to make a new data type that you don't already have access to
m = object() // m
set(m, key, x) // m
get(m, key) // x
set(m, key2, y) // m
get(m, key2) // y
set(m, key3, set(object(), key4, z)) // m
get(get(m, key3), key4) // z
I'll leave this as an exercise for you and I strongly encourage you to do it. I think you will learn a lot in the process and develop a deep understanding and appreciation for what higher-level data types like Array or Object give to you
Since this is a homework I feel like I shouldn't solve it for you, but rather help you in the right direction.
Like Slasher mentioned you can use objects
With JavaScript object one book would look something like
const book = {
title: 'my awesome title',
type: 'novel'
};
book is the object
title is a property with a value 'my awesome title'
type is a property with a value 'novel'
But objects can also have other objects as values. Something like
const BookShelf= {
Book1: {
Title: 'my awesome title',
Type: 'novel'
},
Book2: {
Title: 'my horrible title',
Type: 'sci-fi'
}
};
You can reference the books in the bookshelf in two ways
const book1 = BookShelf.Book1 // Returns the book1 object
const title1 = Book1.Title; // Get the title
const sametitle = BookShelf.Book1.Title // Returns title for book1, same as above.
You can also use brackets:
const book1 = BookShelf['Book1'];
const title1 = BookShelf['Book1']['Title];
You can even make new properties on a object like this:
const Book3 = {
Title: 'running out of ideas'
Type: 'memoir'
};
BookShelf['Book3'] = Book3;
Now the BookShelf has a Book3 property. So your BookShelf object looks like
const BookShelf= {
Book1: {
Title: 'my awesome title',
Type: 'novel'
},
Book2: {
Title: 'my horrible title',
Type: 'sci-fi'
},
Book3 = {
Title: 'running out of ideas'
Type: 'memoir'
};
};
That should get you started :)
JavaScript Objects is a good way to go
1- define a new object:
var myVar = {};
or
var myVar = new Object();
2- usage
// insert a new value, it doesn't matter if the value is a string or int or even another object
// set a new value
myVar.myFirstValue="this is my first value";
// get existing value and do what ever you want with it
var value = myVar.myFirstValue
I've been trying to 'correlate' between user picked answers and an object property name so that if the two matches then it will display what is inside.
My program is a recipe finder that gives back a recipe that consists of the ingredients the user picked.
my code currently looks like:
//property are the ingredients and the value are the recipes that contain those ingredients. The map is automatically generated
``var map = {
"pork" : [recipe1, recipe2, ...],
"beef" : [],
"chicken" :[],
}
//this gets the user pick from the dom
var cucumber = specificVegetable[7];
var lemon = specificFruits[0];
//Then this code finds the intersection of the recipe(recipes that use more than one ingredients)
function intersect(array1, array2)
{
return array1.filter(function(n) {
return array2.indexOf(n) != -1
});
}
var recipiesWithLemon = map["lemon"]; **// makes the lemon object is map**
var recipiesWithCucumber = map["cucumber"]; **// makes the cucumber object in map**
//Here is where I am stuck
function check(){
var both = intersect(recipiesWithLemon, recipiesWithCucumber);
if ( cucumber.checked && lemon.checked){
for (var stuff in map){
if(stuff="cucumber" && stuff="lemon"){
return both;
}
}
}
}
check();
so basically what I tried to do was I made my intersect and then if user pick is lemon and cucumber then look at the properties in the map object. if the name of the property equals to the exact string then return both. That was the plan but the code does not work and I'm not sure how to fix it.
My plan is to write code for every possible outcome the user may makes so I need to find the correlation between the user pick and the map which stores the recipe. I realize this is not the most effective way but I'm stumped on how to do it another way.
Thanks for the help.
Im using the open source project jinqJs to simplify the process.
I also changed your map to an array of JSON objects. If you must have the map object not as an array, let me know. I will change the sample code.
var map = [
{"pork" : ['recipe1', 'recipe2']},
{"beef" : ['recipe3', 'recipe4']},
{"peach" :['recipe5', 'recipe6']},
{"carrot" :['recipe7', 'recipe8']}
];
var selectedFruit = 'peach';
var selectedVeggie = 'carrot';
var selections = [selectedFruit, selectedVeggie];
var result = jinqJs().from(map).where(function(row){
for(var f in row) {
if (selections.indexOf(f) > -1)
return true;
}
return false;
}).select();
document.body.innerHTML += '<pre>' + JSON.stringify(result, null, 2) + '</pre><br><br>';
<script src="https://rawgit.com/fordth/jinqJs/master/jinqjs.js"></script>
this question should be quite simple, but I haven't been able to figure it out.
I want to collect all the VELatLong objects iterating through a list of polygons in JavaScript in order to use the SetMapView() method.
So far I have been able to do with just 2 polygons and my code looks like this:
var points = [];
// Getting the points for first polygon
map.AddShape(shapeOne);
points = shape.GetPoints();
// Getting the points for second polygon and Concatenating "points" with "pointsTwo".
map.AddShape(shapeTwo);
pointsTwo = shape.GetPoints();
points.concat(pointsTwo);
map.SetMapView(points);
But I would like help to how I can do the same thing iterating through a list of polygons?
My iteration code works fine, it looks like this:
function btnPolygons_Click()
{
$.post
(
"/Search/GetPolygons",
null,
function (items) {
$.each
(
items,
function (i, polygonItem) {
var wktShape = polygonItem.PolygonWKT
// Create a VEShape from the WKT representation
var shape = VirtualEarthWKT.ShapeFromWKT(wktShape);
// Add VEShape to Map
map.AddShape(shape);
}
);
},
"json"
);
}
Can you tell me what to add to my iteration code in order to collect all the VELatLong objects iterating through the list of polygons?
This solved my problem:
// Getting the points of the first iteration.
if (i == 0) {
points = shape.GetPoints();
}
// Concatenating the points of the first iteration to the following iterations.
else {
pointsTwo = shape.GetPoints();
points = points.concat(pointsTwo);
}
// Setting the map view in the last iteration.
if (i == items.length - 1) {
map.SetMapView(points);
}