This question already has answers here:
Sort array by firstname (alphabetically) in JavaScript [duplicate]
(23 answers)
Closed 1 year ago.
I am trying to sort an array by names in alphabetic order, with numbers it works, but with names doesn't. Why?
var arr = [{
name: 'Thomas',
age: 19
},
{
name: 'Noé',
age: 17
},
{
name: 'Andrey',
age: 27
},
{
name: 'Luc',
age: 20
}
]
const res = arr.sort((e1, e2) => e1.name - e2.name)
console.log(res)
Strings may not be subtracted, but you can compare them using localeCompare
const res = arr.sort((e1, e2) =>
e1.name.toLowerCase().localeCompare(e2.name.toLowerCase())
);
Related
This question already has answers here:
Sorting an array of objects by property values
(35 answers)
Sorting arrays numerically by object property value
(10 answers)
Closed 21 days ago.
var object = [
{ name: 'Mar', age: 32 ,height:40},
{ name: 'Carla', age: 10 ,height:15},
{ name: 'Hazel', age: 5 ,height:80}
];
Is it possible to sort based on the age element and generate a new sorted object?
Expected result:
var newobject = [
{ name: 'Hazel', age: 5 ,height:80},
{ name: 'Carla', age: 10 ,height:15},
{ name: 'Mar', age: 32 ,height:40}
];
Or you could also return the result sorted in an array, instead of returning it in an object... whatever... uncomplicated, but return it sorted .
var new_sorted_array = [
[Hazel, 5 ,80] ,
[Carla, 10 ,15],
[Mar, 32 ,40]
];
To achieve expected result, you can try below two options
Using array sort method - https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/sort
Second option is by looping array and using Object.values to get output in the format specified in question
var object = [
{ name: 'Mar', age: 32 ,height:40},
{ name: 'Carla', age: 10 ,height:15},
{ name: 'Hazel', age: 5 ,height:80}
];
//Sort array by property age
console.log("Sort by age", object.sort((a, b) => a.age - b.age))
//Using object values
console.log("Sort by age -option2", object.map(v => Object.values(v)).sort((a, b) => a[1] - b[1]))
This question already has answers here:
Calling reduce to sum array of objects returns NaN
(2 answers)
js - array .reduce returns NaN instead of calculated value [duplicate]
(2 answers)
Method reduce javascript [duplicate]
(3 answers)
reduce() method is returning NaN from an array of objects [duplicate]
(1 answer)
Closed last month.
const obj = [
{
name: "john",
marks: 50,
},
{
name: "mary",
marks: 55,
},
{
name: "peter",
marks: 75,
},
];
I want to calculate sum of marks using reduce method.
I tried through this way -
const sum = obj.reduce((next, number) => {
console.log("next", next.marks);
console.log("number", number.marks);
return next.marks + number.marks;
});
console.log(sum);
But I am getting sum as NaN and overall result as -
next 50
number 55
next undefined
number 75
NaN
I am not sure why next is getting undefined in between.
How can I calculate sum through reduce method ?
Pass a default value to reduce as 0
const obj=[{ name: "john", marks: 50 }, { name: "mary", marks: 55 }, { name: "peter", marks: 75 } ];
const sum = obj.reduce((acc, number) => {
return acc+ number.marks;
}, 0);
console.log(sum)
This question already has answers here:
From an array of objects, extract value of a property as array
(24 answers)
Closed 3 years ago.
How can i create another array by filtering one json array and include just the values pairs of a specific key?
Example (Filtering Value Pairs of Number Keys):
Array:
{ Name: 'abcd', Number: '1234' },
{ Name: 'efgh', Number: '5678' }
]````
Result Array:
````var filteredarray = ['1234','5678'];````
Thanks!
const a = [
{ Name: 'abcd', Number: '1234' },
{ Name: 'efgh', Number: '5678' }
]
function getNumbers(){
return a.map(item => item.Number);
}
getNumbers();
This question already has answers here:
Find object by id in an array of JavaScript objects
(36 answers)
Closed 3 years ago.
So I have array with object inside. That object has a property call name that is a string of values
How can I return object that has "apples" in the name properties
fruits = [
{
name: 'apples, lemon',
quantity: 2
},
{
name: 'bananas, pearl',
quantity: 0
},
{
name: 'cherries,
pineapple',
quantity: 5
}
];
You can use Array.prototype.filter() with String.prototype.includes()
var fruits = [
{
name: 'apples, lemon',
quantity: 2
},
{
name: 'bananas, pearl',
quantity: 0
},
{
name: 'cherries, pineapple',
quantity: 5
}
];
const filteredFruits = fruits.filter(item => item.name.includes("apples"));
console.log(filteredFruits);
let fruits=[{name:'apples, lemon',quantity:2},{name:'bananas, pearl',quantity:0},{name:'cherries, pineapple',quantity:5}];
let filteredFruits = fruits.filter(fruit => {
return fruit.name.indexOf("apples") !== -1;
});
console.log(filteredFruits);
This question already has answers here:
Get JavaScript object from array of objects by value of property [duplicate]
(17 answers)
Find object by id in an array of JavaScript objects
(36 answers)
Closed 5 years ago.
Let's say I have an array of objects
const arr = [ {name:"Bob", age: 20}, { name: "Sara", age: 22}, { name:
Tom, age:20} ];
I want to print objects with particular property, for example only those with the age == 20. So The result would be
const arr = [ {name:"Bob", age: 20}, { name: Tom, age:20} ];
I really want to do it with ES6. Do you have any suggestion what method could be used?
This will do
var filteredData = arr.filter((e) => e.age === 20)