Extract array from object?

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8 Answers

extractarrayobject
90%

Easily extracting multiple properties from array of objects:,In Lodash you can get values of a property in array by following method,I want to extract a field from each object, and get an array containing the values, for example field foo would give array [ 1, 3, 5 ].

Here is a shorter way of achieving it:

let result = objArray.map(a => a.foo);

OR

let result = objArray.map(({
   foo
}) => foo)
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88%

In the above program, the property's value of key a is extracted from each object of an array.,In the above program, the property value of key a is extracted from each object of an array.,In this example, you will learn to write a JavaScript program that will extract the value of a property as an array from an array of objects.

// program to extract value as an array from an array of objects

function extractValue(arr, prop) {

   // extract value from property
   let extractedValue = arr.map(item => item[prop]);

   return extractedValue;

}

const objArray = [{
   a: 1,
   b: 2
}, {
   a: 4,
   b: 5
}, {
   a: 8,
   b: 9
}];

// passing an array of objects and property 'a' to extract
const result = extractValue(objArray, 'a');
console.log(result);

Output

[1, 4, 8]

Note: You could also use a regular function instead of an arrow function.

let extractedValue = arr.map(function(item) {
   return item[prop]
});
// program to extract value as an array from an array of objects

function extractValue(arr, prop) {

   let extractedValue = [];

   for (let i = 0; i < arr.length; ++i) {

      // extract value from property
      extractedValue.push(arr[i][prop]);
   }
   return extractedValue;
}

const objArray = [{
   a: 1,
   b: 2
}, {
   a: 4,
   b: 5
}, {
   a: 8,
   b: 9
}];

// passing an array of objects and property 'a' to extract
const result = extractValue(objArray, 'a');
console.log(result);

Output

[1, 4, 8]
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72%

Suppose, we have an array of objects like this −,Therefore, one array for the name property of each object, one for total and one for value. If there existed more properties, we would have separated more arrays.,Convert array of arrays to array of objects grouped together JavaScript

Suppose, we have an array of objects like this −

const arr = [{
   name: 'Client 1',
   total: 900,
   value: 12000
}, {
   name: 'Client 2',
   total: 10,
   value: 800
}, {
   name: 'Client 3',
   total: 5,
   value: 0
}];
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65%

Let's take a look at how it's done, starting with the array. ,One of the new features is the ability of destructuring arrays and objects. This is an easy and convenient way of extracting data from arrays and objects.,Ok, now that we’ve got the array covered, let’s look at have we can extract data from objects.

Say you got an array of names.

const names = ['Luke', 'Eva', 'Phil'];
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75%

Extract data from arrays and objects in javascript,In this blog, we are going to explore how to extract data from arrays and objects in javaScript using destructuring.,Syntax of javascript destructuring(Object patterns):

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   position: absolute;top: 0;right: 0;z - index: 1;border - radius: 0 5 px 0 5 px;padding: 0.25 rem 0.6 rem;border: none;cursor: pointer;background: #44475a;color:rgb(248, 248, 242);-webkit-transition:all 200ms ease;transition:all 200ms ease;font-size:12px;}.css-1r5hp7i:disabled{cursor:not-allowed;}.css-1r5hp7i:not(:disabled):hover,.css-1r5hp7i:not(:disabled):focus{background:# 8257E6;
}
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   display: inline - block;width: 2 rem; - webkit - user - select: none; - moz - user - select: none; - ms - user - select: none;user - select: none;opacity: 0.3;
}
1
var ten, twenty;
2[ten, twenty] = [10, 20];
3 console.log(ten);
4 //105console.log(twenty); 6//20
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40%

Pretag
 Pretag team - issue, fix, solve, resolve
22%

In this article, we’ll look at how to create an array from property values extracted from an array of JavaScript objects.,Extracting a property value from an array of JavaScript objects is something that we’ve to do often.,We can use plain JavaScript or Lodash to extract the value of a property from each object in an array.

For instance, we can write:

const objArray = [{
   foo: 1
}, {
   foo: 2
}, {
   foo: 3
}]
const result = objArray.map(a => a.foo);
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60%

From this array of objects, if you wish to extract the values of all object properties called "name" for example into a new array, you can do so in the following ways: , Let's suppose you have the following array of objects: , © 2011 - 2021 Designcise. All Rights Reserved.

Let's suppose you have the following array of objects:

const users = [{
      id: 0,
      name: 'John'
   },
   {
      id: 1,
      name: 'Wayne'
   },
   {
      id: 2,
      name: 'David'
   },
];
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