How do I merge two dictionaries in Javascript? [duplicate]
Solution 1:
You could use Object.assign.
var a = { fruit: "apple" },
b = { vegetable: "carrot" },
food = Object.assign({}, a, b);
console.log(food);For browser without supporting Object.assign, you could iterate the properties and assign the values manually.
var a = { fruit: "apple" },
b = { vegetable: "carrot" },
food = [a, b].reduce(function (r, o) {
Object.keys(o).forEach(function (k) { r[k] = o[k]; });
return r;
}, {});
console.log(food);Solution 2:
Ways to achieve :
1. Using JavaScript Object.assign() method.
var a = {};
a['fruit'] = "apple";
var b = {};
b['vegetable'] = "carrot";
var food = Object.assign({}, a, b);
console.log(food);2. Using custom function.
var a = {};
a['fruit'] = "apple";
var b = {};
b['vegetable'] = "carrot";
function createObj(obj1, obj2){
var food = {};
for (var i in obj1) {
food[i] = obj1[i];
}
for (var j in obj2) {
food[j] = obj2[j];
}
return food;
};
var res = createObj(a, b);
console.log(res);3. Using ES6 Spread operator.
let a = {};
a['fruit'] = "apple";
let b = {};
b['vegetable'] = "carrot";
let food = {...a,...b}
console.log(food)Solution 3:
You could use the spread operator in es6, but you would need to use babel to transpile the code to be cross browser friendly.
const a = {};
a['fruit'] = "apple";
const b = {};
b['vegetable'] = "carrot";
const food = { ...a, ...b }
console.log(food)Solution 4:
Create a Utility function which can extend Objects, like:
function extendObj(obj1, obj2){
for (var key in obj2){
if(obj2.hasOwnProperty(key)){
obj1[key] = obj2[key];
}
}
return obj1;
}
And then extend this food object with the another Objects. Here is example:
food = extendObj(food, a);
food = extendObj(food, b);