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I need help creating a JavaScript object:
I have three fields from the input form in React state object:
{
calories: "45",
fats: "56",
proteins: "67"
}
I would like to create a new array i.e. nutrientInformation from this data. The output should resemble this:
nutrientInformation: [
{
calories: 45
},
{
fats: 56
},
{
proteins: 67
}
]
const state = { calories: "45", fats: "56", proteins: "67" };
const nutrientInformation = Object.entries(state).map(([key, value]) => ({
[key]: value
}));
console.log(nutrientInformation);
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There is an array
[ [ 'Alex', '167%' ],
[ 'Benjamin', '127%' ],
[ 'Elijah', '117%' ],
[ 'Liam', '136%' ],
[ 'Theodore', '135%' ],
[ 'Mia', '128%' ] ]
I need to make it look like this
[ 'Alex 167%',
'Benjamin 127%',
'Elijah 117%',
'Liam 136%',
'Theodore 135%',
'Mia 128%' ]
I need the elements of each nested array to be combined into a string and such a number of spaces are inserted between them so that the length of this string is 29 characters
You could use a map combined with padEnd
const items = [
['Alex', '167%'],
['Benjamin', '127%'],
['Elijah', '117%'],
['Liam', '136%'],
['Theodore', '135%'],
['Mia', '128%']
];
const combined = items.map(([name, percent]) =>
name.padEnd(29 - percent.length, ' ') + percent
);
console.log(combined);
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Say I have an array of objects:
const myArray = [{ color: 'red' }, { color: 'blue'}, { color: 'yellow'}]
How can I expand the object to add a key value pair to each element where the key is number and the value is a number that increments by one in each object? My desired outcome is:
const myNewArray = [{ color: 'red', number: 1 }, { color: 'blue', number: 2 }, { color: 'yellow', number: 3 }]
const myNewArray = myArray.map((item, index) => { return {"number" :index, ...item} } )
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I simply want to get 3 highest price value objects as new array. How would I do that easily ?
For example i got array like this ..
const data =
[ { name: 'x', color: 'red', price: 15 }
, { name: 'y', color: 'black', price: 5 }
, { name: 'z', color: 'yellow', price: 25 }
, { name: 't', color: 'blue', price: 10 }
, { name: 'n', color: 'blue', price: 60 }
]
You can sort the array by the price property (with Array.sort) and get the first three items (with Array.slice):
const arr=[{name:"x",color:"red",price:15},{name:"y",color:"black",price:5},{name:"z",color:"yellow",price:25},{name:"t",color:"blue",price:10},{name:"n",color:"blue",price:60}];
const result = arr.sort((a,b) => b.price - a.price).slice(0, 3)
console.log(result)
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My current object is of the form:
[{Vol:'AB', freq:[{used:4786, avail:1319, res:249}]}
,{Vol:'CD', freq:[{used:1101, avail:412, res:674}]}]
I need to change it to the form:
[{Vol:'AB', freq:{used:4786, avail:1319, res:249}}
,{Vol:'CD', freq:{used:1101, avail:412, res:674}}]
How can this be done.
Try
obj.map( s => (s.freq = s.freq[0], s) );
Explanation
Iterate the array using map
Replace each items freq's array with its first item
Demo
var input = [{
Vol: 'AB',
freq: [{
used: 4786,
avail: 1319,
res: 249
}]
}, {
Vol: 'CD',
freq: [{
used: 1101,
avail: 412,
res: 674
}]
}];
input = input.map(s => (s.freq = s.freq[0], s));
console.log(input);
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I have an Array as following
[
{ id: "172~~81259", title: "Absurdity (Theatre)" },
{ id: "2803~~281318", title: "Academic Administration" },
{ id: "3722~~296974", title: "Accessories Design" },
{ id: "23843", title: "Accommodation and Front Office Professional" },
{ id: "16834", title: "Accountant" },
{ id: "853~~64400", title: "Accounting Information System" },
{ id: "4403~~40149", title: "Activation and Experiential Advertising" },
{ id: "15~~39301", title: "Activation and Experiential Advertising" }
]
I want to filter(remove) already selected values from this array.so how can i filter by knowing the value only.
You need array.filter. It generates a new array containing only the items which cause the supplied callback to return true. Use that callback to check the value you want to check, whatever that value is.