Develop Reference

Split a JSON array into JS variables - Bixby

So I have a API outputting JSON to my JS code (http://api.opentripmap.com/0.1/ru/places/bbox?lon_min=-123.049641&lat_min=37.550392&lon_max=-122.049641&lat_max=38.550392&kinds=foods&format=geojson&apikey=5ae2e3f221c38a28845f05b685eac8210f10fb196793a9d4f6653c25).
However it contains a JSON Array that looks like this- "coordinates": [ -122.510216, 37.769474 ]
Is there a way to split it into separate JS variables like one variable for the left side and another for the right side. At the moment the array is causing my code to crash as it can only accept one input in each slot.
Sorry If this is a simple question, I haven't been able to solve this yet...
EDIT:
Sorry for the terrible question layout. I have tried to splice and splitting the array with no success (splicing lead to a whole load of undefined errors).
My current code is
module.exports.function = function findLunch(myLocation) {
var loc_long_max = Number(myLocation.longitude) //grab longitude from user
var loc_lat_min = Number(myLocation.latitude) //grab latitude from User
var loc_long_min = loc_long_max - 0.5;
var loc_lat_max = loc_lat_min + 0.5;
var url_all = "http://api.opentripmap.com/0.1/ru/places/bbox?lon_min=" + loc_long_min + "&lat_min=" + loc_lat_min + "&lon_max=" + loc_long_max + "&lat_max=" + loc_lat_max + "&kinds=foods&format=geojson&apikey=5ae2e3f221c38a28845f05b685eac8210f10fb196793a9d4f6653c25"
var results = http.getUrl(url_all, { format: 'json' }); //gets json info from url_all.
console.log(results.features[rand].properties.name)
//console.log(results.feautres[rand].properties.rate)
console.log(results.features[rand].geometry.coordinates)
//console.log(results);
for (var i = rand; i < results.features.length; i++) {
console.log(results.features[rand].properties.name)
console.log(results.features[rand].properties.rate)
var businesses = {
name: results.features[rand].properties.name,
rating:results.features[rand].properties.rate,
coordinates: results.features[rand].geometry.coordinates
}
}
return businesses
So the coordinates need to be split and then be in the businesses var which is then outputted to Bixby....
EDIT 2 : Fixed it - thanks everyone for the help!
Thanks!

Not sure if this is smth you're asking but you can use destructuting assignment to assign items in an array to variables:
const coordinates = [ -122.510216, 37.769474 ];
const [coordinateOne, coordinateTwo] = coordinates;
console.log(coordinateOne) // -122.510216
console.log(coordinateTwo) // 37.769474

You can use destructuring to assign the first and second elements of the array to variables in a simple way:
const coordinates = [-122.510216, 37.769474];
const [left, right] = coordinates;
console.log(left);
console.log(right);

JS - Pushing data into JSON structure using forEach loops on Arrays

I am attempting to extract JSON values (from structure called jsonWithListOfStatesAndCounters) if it matches with an element in my inputted array (inputedJurisdictionArray). My inputed array contains sting values that include singular or multiple state names (i.e. var inputedJurisdictionArray = ["Iowa", "California, Indiana, Delaware", "Florida"]). The singular State values in this array are handled normally at the end, but the multiple state values is where it gets tricky. I am using split() in order to turn them into another array so they can get processed one by one. Anytime one of the states from this inputed array matches with a "state" value in jsonWithListOfStatesAndCounters, I am extracting it into another JSON structure and pushing it at the end of every block into my initial variable myJurisdictionJSON. The problem I am having is that once these forEach loops are completed, I am still left with my original values in myJurisdictionJSON, instead of the val and counter that should be extracted. The jsonWithListOfStatesAndCounters definitely contains the values that should match with the elements of my inputedJurisdictionArray, but the information is not being pushed into myJurisdictionJSON. What am I doing wrong? Any tips/pointers will be helpful.
var myJurisdictionJSON = [{
jurisdiction_val: 'jurisdiction_val',
jurisdiction_counter: 'jurisdiction_counter'
}];
inputedJurisdictionArray.forEach(function each(item) {
if (Array.isArray(item)) {
item.forEach(each);
} else {
var jurisdictionInput = item;
jsonWithListOfStatesAndCounters.forEach(function each(item) {
if (Array.isArray(item)) {
item.forEach(each);
} else {
if (jurisdictionInput.includes(",") === true){//Checking if more than one jurisdiction in string
var jurisdictionArr = jurisdictionInput.split(", ");
var jurisdictionCounter = item.jurisdictionCounter;
var jurisdictionState = item.jurisdictionState;
jurisdictionArr.forEach(function(element) {
if (myJurisdictionJSON.jurisdiction_counter == 'jurisdiction_counter'){ // If nothing is pushed into our predefined JSON object
if (jurisdictionState.toLowerCase() == trim(element.toLowerCase())) {
var jurisdictionJSON_inner = {
jurisdiction_val: element,
jurisdiction_counter: jurisdictionCounter
};
myJurisdictionJSON.push(jurisdictionJSON_inner);
return;
}
}else if (myJurisdictionJSON.jurisdiction_counter != 'jurisdiction_counter'){ // if an item has been pushed into myJurisdictionJSON, append the next items
var jurisdictionCounter = item.jurisdictionCounter;
var jurisdictionState = item.jurisdictionState;
if (jurisdictionState.toLowerCase() == trim(jurisdictionInput.toLowerCase())) {
jurisdictionJSON_inner.jurisdiction_val = jurisdictionJSON_inner.jurisdiction_val + ", " + jurisdictionInput;
jurisdictionJSON_inner.jurisdiction_counter = jurisdictionJSON_inner.jurisdiction_counter + ", " + jurisdictionCounter;
myJurisdictionJSON.push(jurisdictionJSON_inner);
return;
}
}
});
}
else{// if only one jurisdiction state in jurisdictionInput string
var jurisdictionCounter = item.jurisdictionCounter;
var jurisdictionState = item.jurisdictionState;
if (jurisdictionState.toLowerCase() == trim(jurisdictionInput.toLowerCase())) {
var jurisdictionJSON_inner = {
jurisdiction_val: jurisdictionInput,
jurisdiction_counter: jurisdictionCounter
};
myJurisdictionJSON.push(jurisdictionJSON_inner);
return;
}
}
}
});

I'm not totally sure the output is what you want but it's close.
// input data as per your example
let inputedJurisdictionArray = [
'Iowa',
'California, Indiana, Delaware',
'Florida'
];
// I had to make this part up. It's missing from the example
let jsonWithListOfStatesAndCounters = [{
jurisdictionCounter: 2,
jurisdictionState: 'Florida'
},
{
jurisdictionCounter: 4,
jurisdictionState: 'Indiana'
},
{
jurisdictionCounter: 3,
jurisdictionState: 'Texas'
}
];
// first, fix up inputedJurisdictionArray
// reduce() loops over each array element
// in this case we're actually returning a LARGER
// array instead of a reduced on but this method works
// There's a few things going on here. We split, the current element
// on the ','. Taht gives us an array. We call map() on it.
// this also loops over each value of the array and returns an
// array of the same length. So on each loop, trim() the whitespace
// Then make the accumulator concatenate the current array.
// Fat arrow ( => ) functions return the results when it's one statement.
inputedJurisdictionArray = inputedJurisdictionArray.reduce(
(acc, curr) => acc.concat(curr.split(',').map(el => el.trim())), []
);
// now we can filter() jsonWithListOfStatesAndCounters. Loop through
// each element. If its jurisdictionState property happens to be in
// the inputedJurisdictionArray array, then add it to the
// myJurisdictionJSON array.
let myJurisdictionJSON = jsonWithListOfStatesAndCounters.filter(el =>
inputedJurisdictionArray['includes'](el.jurisdictionState)
);
console.log(myJurisdictionJSON);

How to convert arrays to objects in javascript?

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

JavaScript database correlation

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>

Create stacked array with javascript

I have an original two-dimensional array which represents the 100% version budget per year, looking like:
budget = [['2001-01-01', 100], ['2001-01-02', 110], ... , ['2001-12-31', 140]]
Now I need to create subarrays of the budget for projects. For example:
project1 = [['2001-01-01', 10], ['2001-01-02', 11]]
meaning, that it goes for 2 days and uses 10% of the available budget.
I create the project arrays by the following function:
project1 = [[]];
project1 = new_project(budget, 0, 1, 0.1);
function new_project(origin, start, end, factor) {
var result = [[]];
result = origin.slice(parseInt(start), parseInt(end)).map(function (item) {
return [item[0], parseInt(item[1]) * factor]
});
return result;
}
Problem
How can I decrease my budget array now by the values of my created project?
I need to modifiy budget on the fly by calling new_project in order to get:
budget = [['2001-01-01', 90], ['2001-01-02', 99],..., ['2001-12-31', 140]]
jsfiddle of the setup
http://jsfiddle.net/gcollect/7DAsL/

You can use the built-in array forEach() method to loop over the subset of the budget (ie project1) and change the original budget's values. I've made a function called decreaseBudget() which will do that for you:
function decreaseBudget(original, subset) {
// Loop over the subset's items.
subset.forEach(function(item, index){
// Get the original amount out of the original item.
// As we are looping over subset it will always have less items then the original
// so no need to check if the index is valid.
var originalItemAmount = original[index][1];
// Decrease the amount and set it back in it's original place
original[index][1] = (originalItemAmount - item[1]);
});
};
Call it with the budget and the project1 arrays as arguments to change the value of the budget array. Take a look at the updated fiddle:
http://jsfiddle.net/7DAsL/4/
If you prefer decreaseBudget() won't change the original array but return a copy you could use the array .slice() method to make a shallow copy of the original, make the changes to the copy and return it.

I got the answer. see http://jsfiddle.net/gcollect/7DAsL/2/
solution
function new_project(origin, start, end, factor) {
var result = [
[]
];
result = origin.map(function (item) {
return [item[0], (item[1] * factor)]
});
for (var i = 0; i < result.length; i++) {
origin[i][1] = parseInt(origin[i][1]) - parseInt(result[i][1]);
}
result = origin.slice(parseInt(start), parseInt(end));
return result;
};