I have a javascript object like this,
{
apple: { .... },
orange: { ... },
mango: { ... },
jackfruit: { ... }
}
and I want to grenerate a new object from this object. I want values of cetain keys only, like ['mango', apple' ]
Is there any filter function to filter these items from this object using this array?
My resulting object should be like
{
mango: { ... }
apple: { ... }
}
You could spread the single objects and assign them to a new object.
function subtract(object, keys) {
return Object.assign({}, ...keys.map(key => ({ [key]: object[key] })));
}
var fruits = { apple: 'a', orange: 'o', mango: 'm', jackfruit: 'j' };
console.log(subtract(fruits, ['mango', 'orange']));
If you can use the Ramda library,
R.pick(['a', 'd'], {a: 1, b: 2, c: 3, d: 4}); //=> {a: 1, d: 4}
R.pick(['a', 'e', 'f'], {a: 1, b: 2, c: 3, d: 4}); //=> {a: 1}
You can use forEach loop over the array for which you want to get the value for the key in fruitsObj
var fruitsObj = {
apple: {rate: 100},
orange: { rate: 200 },
mango: { rate: 300 },
jackfruit: { rate: 400 }
}
var filterArray = ['mango', 'apple'];
var res = [];
filterArray.forEach((fruit)=> res.push(fruitsObj[fruit]));
console.log(res);If you want to use filter and map, you can filter out the keys first and then use map to get the value for that keys.
var fruitsObj = {
apple: {rate: 100},
orange: { rate: 200 },
mango: { rate: 300 },
jackfruit: { rate: 400 }
}
var filterArray = ['mango', 'apple'];
var res = Object.keys(fruitsObj).filter(fruitKey => ['mango','apple'].indexOf(fruitKey) !== -1).map(filterKey => fruitsObj[filterKey]);
console.log(res);You can filter data of specific keys like this.
var FilteredObjectsByKeys = Object.assign({}, ...['mango', 'apple'].map(x => fruits[x]));
Is there any filter function to filter these items from this object using this array?
Yes, you can use reduce method.
let dict = {
apple: { color: 'red'},
orange: { color: 'orange' },
mango: { color:'green' },
jackfruit: { color: 'yellow' }
}
let array = ['mango', 'apple' ]
console.log(array.reduce((obj, key) => ({ ...obj, [key]: dict[key] }), {}));Another method is using destructing feature.
let dict = {
apple: { color: 'red'},
orange: { color: 'orange' },
mango: { color:'green' },
jackfruit: { color: 'yellow' }
}
let array = ['mango', 'apple' ]
console.log((({ mango, apple}) => ({ mango, apple }))(dict));
Try this :
var jsObj = {
apple: "Apple",
orange: "Orange",
mango: "Mango",
jackfruit: "jackFruit"
}
var arr = ['mango', 'apple'];
var newObj = {};
arr.filter(item => newObj[item] = jsObj[item]);
console.log(newObj);
Object.keys(obj).filter(r => ['mango','apple'].indexOf(r) > -1).map(i => obj[i]);should be enough.