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how to map more than one property from array of object in javascript


By : user2175177
Date : October 16 2020, 08:10 AM
wish helps you You can use .map() with Object Destructuring:
code :
let data = [
    {a:1,b:5,c:9}, {a:2,b:6,c:10},
    {a:3,b:7,c:11}, {a:4,b:8,c:12}
];
          
let result = data.map(({ a, b }) => ({a, b}));

console.log(result);
.as-console-wrapper { max-height: 100% !important; top: 0; }


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setting data property of a jquery ajax method to contain a javascript object with an array property


By : Tanner
Date : March 29 2020, 07:55 AM
seems to work fine You are attempting to use myObject.EngineSpecs as an object property name, which isn't allowed (because of the . in the middle). Do this instead:
code :
var data = {
       myObject: {
            EngineSpecs : [{
              EngineID: 100010017,
              Displacement: 7.2,
              Gas: false
            }, {
              EngineID: 300200223,
              Displacement:  3.2,
              Gas: true
            }]
       }
};
  var myObject = {
        EngineSpecs : [{
          EngineID: 100010017,
          Displacement: 7.2,
          Gas: false
        }, {
          EngineID: 300200223,
          Displacement:  3.2,
          Gas: true
        }]
   };

JavaScript get value or property of an Array of objects if object has that property


By : Julio Crosciatti
Date : March 29 2020, 07:55 AM
I wish this help you You'll want to make use of hasOwnProperty here:
code :
for (var i = 0; i < test.length; i++) {
    if (test[i].hasOwnProperty('c')) {
        alert(test[i].c); // do something with test[i].c
        break; // assuming there is only ever 1 item called c, once we find it we can break out of the whole loop.
    }
}
var objectsThatHaveC = $.grep(test, function(obj) {
    return obj.hasOwnProperty('c');
});

if (objectsThatHaveC.length) {
    alert(objectsThatHaveC[0].c); // assuming there's only 1 object with a 'c', otherwise you'd still have to loop here
}

JavaScript Array to Object: changing array elements to Object property and value


By : Pete
Date : March 29 2020, 07:55 AM
should help you out I need to build a function that can take in an array, and without changing the array, return an object whose property is the first element of that array, and that property's value is the last element of the array: , Here you go
code :
var arr= ["Orange", "glass", "hat", "juicy", "green"]


function firstAndLast(arr){
    return {[arr[0]] : arr[arr.length - 1]}
}
{ Orange : 'green' }

Cannot read property 'push' of undefined creating an array property of an object (Javascript)


By : user405553
Date : March 29 2020, 07:55 AM
I hope this helps you . My constructor Mash needs to have a property that is an array of Grain objects. This is as far as I got and now I am getting an error with my push. Any thoughts? , You forgot to initialize the variable grains in Mash constructor.
code :
function Mash(volume) {
    this.grains = [];
    this.volume = volume;


    this.addGrain = function(grain) {
        this.grains.push(grain);
    }

    this.calcEOG = function() {
        let total = 0;
        this.grains.forEach(item => {
            total += item.calMaxPPG();
        });
        return total / this.volume;

    };
}
function Grain(name, maxPPG, quantity) {
    this.name = name;
    this.maxPPG = maxPPG;
    this.quantity = quantity;


    this.calMaxPPG = function() {
        return this.maxPPG * this.quantity;
    };
}
// before dealing with data, work on your classes
function Grain(name, maxPPG, quantity) {
    this.name = name;
    this.maxPPG = maxPPG;
    this.quantity = quantity;
}
// and as @HMR said, always declare your class functions with prototypes
Grain.prototype.MaxPPG = function() {
    return this.maxPPG * this.quantity;
};
function Mash(volume, grains) {
    this.volume = volume;
    this.grains = grains;
}
Mash.prototype.calcEOG = function() {
    var total = 0;
    this.grains.forEach(item => {
        total += item.MaxPPG();
    });
    return total / this.volume;
};
// So after all you'll instance your classes easy.
var grain1 = new Grain("Pale Malt (2 Row)", 9, 37),
    grain2 = new Grain("Caramel/Crystal Malt - 20L", .75, 35);
var mash = new Mash(7, [grain1, grain2]); // note that litle change I did :p
console.log(mash.calcEOG());

Javascript find object with matching property in array of objects and get another property if exists


By : Magdalena Beleva
Date : March 29 2020, 07:55 AM
Hope that helps The smallest method is not necessarily the most efficient. I would do it this way:
code :
let wantedProperty = (arrayOfObjects.find(obj => obj.id === wantedObject.id) || {}).title || 'None Found';
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