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I have here the data
var sampleArray = [
{ "Rating 1": -75 },
{ "Rating 2": -70 },
{ "Rating 3": 98 },
{ "Rating 4": -88 },
{ "Rating 5": 29 },
];
I want to sort it to output the following
Highest rating
Lowest rating
Rating that is near 0 (if there are 2 results, the positive will be chosen example:-1,1 then 1 will be chosen)
I'm stuck on getting the second value only which is the rating. I've tried the following codes to check if I can get the rating, but it shows the entire value of array 0
function topProduct(productProfitArray) {
return productProfitArray[0];
}
You can do this with reduce and a bit of logic to keep track of your min,max and diff from zero items
var sampleArray = [
{ "Rating 1": -75 },
{ "Rating 2": -70 },
{ "Rating 3": 98 },
{ "Rating 4": -88 },
{ "Rating 5": 29 },
];
var result = sampleArray.reduce( (acc,i) => {
var val= Object.values(i)[0];
if(val > acc.max)
{
acc.maxEntry = i;
acc.max = val;
}
if(val < acc.min)
{
acc.minEntry = i;
acc.min = val;
}
var diffFromZero = Math.abs(0-val);
if(diffFromZero < acc.diffFromZero)
{
acc.diffFromZero = diffFromZero;
acc.diffEntry = i;
}
return acc;
},{min:Number.POSITIVE_INFINITY, max:Number.NEGATIVE_INFINITY,diffFromZero:Number.POSITIVE_INFINITY});
console.log("min",result.minEntry);
console.log("max",result.maxEntry);
console.log("closeToZero",result.diffEntry);
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I have an object like below
[
{
"day" : "monday",
"value": 1
},
{
"day" : "tuesday",
"value": 2
},
...
]
Is there any native javascript way to replace the key with a new key. Here I need to replace the "day" & "value" with "x" & "y" respectively. (like below)
[
{
"x" : "monday",
"y": 1
},
{
"x" : "tuesday",
"y": 2
},
...
]
you can use map and inside the call back create a new object and modify it as required. Then return this object
const data = [{
"day": "monday",
"value": 1
},
{
"day": "tuesday",
"value": 2
}
];
const newData = data.map((item) => {
const obj = {};
for (let keys in item) {
if (keys === 'day') {
obj['x'] = item[keys]
}
if (keys === 'value') {
obj['y'] = item[keys]
}
};
return obj
});
console.log(newData)
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I have a json file:
[
{
"name": "Cocktail 1",
"ingredients": {
"rum": 12,
"coke": 48
}
}, {
"name": "Cocktail 2",
"ingredients": {
"gin": 24,
"tonic": 60
}
}]
Now I want to get a list of the keys of each "name" object. At the end there should be ths list
var mydata[0] = rum
var mydata[1] = coke
var mydata[2] = gin
var mydata[3] = tonic
and save it into an array.
What i have tried
var mydata = JSON.parse("jsonstring").ingredients;
hope this is understanable?
for each data in the array (map)
you want the ingredient part (.ingredients),
extract the keys (Object.keys)
and flatten the array (.flat())
array.map(a => a.ingredients).map(a => Object.keys(a)).flat();
You may prefer loop style. the only difference is flattening occurs with ... operator.
var results = [];
for (let a of array) {
results.push(...Object.keys(a.ingredients))
}
My proposition is :
'use strict'
const array = [
{
"name": "Cocktail 1",
"ingredients": {
"rum": 12,
"coke": 48
}
},
{
"name": "Cocktail 2",
"ingredients": {
"gin": 24,
"tonic": 60
}
}
]
const mydata = array.map((val) => {
return Object.keys(val.ingredients);
}).flat();
console.log(mydata)
// expected output: Array ["rum", "coke", "gin", "tonic"]
// Now you can get :
var mydata[0] = rum
var mydata[1] = coke
var mydata[2] = gin
var mydata[3] = tonic
Hope that help you? Thank
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This is my data,
"time" is number
[
{
"time": 202007150800,
"count": 10
},
{
"time": 202007160700,
"count": 11
},
{
"time": 202007160900,
"count": 12
}
]
How do I use "time" group data from 8 o'clock yesterday to 8 o'clock today and sum "count"
,For example, 7/15 data is 7/15 08:00 - 7/16 07:00
like this:
[
{
"time": 20200715,
"count": 21
},
{
"time": 20200716,
"count": 12
}
]
Try this function
function mapData(data) {
let result = [];
data.forEach(element => {
let t = element.time + 9200;
let substr = t.toString().substr(0, 8);
if(!result[substr])
result[substr] = 0;
result[substr] += element.count;
});
let returnResult = [];
result.forEach((element, index) =>
returnResult.push({
time: index,
count: element
})
);
return returnResult;
}
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I set the data to a key called 'todo' in Local Storage.
The structure is like this.
key: todo
value : [{"text":"text1","idx":1, "complete":"Y"},
{"text":"text2","idx":2, "complete":"N"},
{"text":"text4","idx":4, "complete":"Y"}]
My to-do list can be deleted and changed between 'complete' and 'incomplete' status.
I want to change the order of to-do to the bottom when it is completed.
For example,
{"text": "text1", "idx": 1, "complete": "Y"}
When the "complete" value of this object has changed to "N".
({"text": "text1", "idx": 1, "complete": "N"})
I want this result.
key: todo
value : [{"text":"text4","idx":4, "complete":"Y"},
{"text":"text2","idx":2, "complete":"N"},
{"text":"text1","idx":1, "complete":"N"}]
The completed to-do wants to appear at the bottom.
Use custom sort function Array.prototype.sort(function(){})
let tasks = {
key: "todo",
value: [{
"text": "text1",
"idx": 1,
"complete": "Y"
},
{
"text": "text2",
"idx": 2,
"complete": "N"
},
{
"text": "text4",
"idx": 4,
"complete": "Y"
}
]
};
tasks.value.sort((a1, a2) => {
if (a1.complete == "Y") {
if (a2.complete == "Y")
return 0;
else
return -1;
} else {
if (a2.complete == "Y")
return 1;
else
return 0;
}
})
console.log(tasks);
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I have data like:
var data = [
{
items: [
{
id: 123
},
{
id: 234
},
{
id: 123
}
]
}, {
items: [
{
id: 123
},
{
id: 234
}
]
}
]
so, I want count object deep in array inside of all data by property 'id'.
ex: data.countObject('id',123) //return 3.
and my data have about xx.000 item, which solution best?
Thanks for help (sorry for my English)
You can use reduce & forEach. Inside the reduce callback you can access the items array using curr.items where acc & curr are just parameters of the call back function. Then you can use curr.items.forEach to get each object inside items array
var data = [{
items: [{
id: 123
},
{
id: 234
},
{
id: 123
}
]
}, {
items: [{
id: 123
},
{
id: 234
}
]
}];
function getCount(id) {
return data.reduce(function(acc, curr) {
// iterate through item array and check if the id is same as
// required id. If same then add 1 to the accumulator
curr.items.forEach(function(item) {
item.id === id ? acc += 1 : acc += 0;
})
return acc;
}, 0) // 0 is the accumulator, initial value is 0
}
console.log(getCount(123))