I have this object. I want to iterate this object in JavaScript. How is this possible?
var dictionary = {
"data": [
{"id":"0","name":"ABC"},
{"id":"1","name":"DEF"}
],
"images": [
{"id":"0","name":"PQR"},
{"id":"1","name":"xyz"}
]
};
This question is related to
javascript
arrays
Using a generator function you could iterate over deep key-values.
function * deepEntries(obj) { _x000D_
for(let [key, value] of Object.entries(obj)) {_x000D_
if (typeof value !== 'object') _x000D_
yield [key, value]_x000D_
else _x000D_
for(let entries of deepEntries(value))_x000D_
yield [key, ...entries]_x000D_
}_x000D_
}_x000D_
_x000D_
const dictionary = {_x000D_
"data": [_x000D_
{"id":"0","name":"ABC"},_x000D_
{"id":"1","name":"DEF"}_x000D_
],_x000D_
"images": [_x000D_
{"id":"0","name":"PQR"},_x000D_
{"id":"1","name":"xyz"}_x000D_
]_x000D_
}_x000D_
_x000D_
for(let entries of deepEntries(dictionary)) {_x000D_
const key = entries.slice(0, -1).join('.')_x000D_
const value = entries[entries.length-1]_x000D_
console.log(key, value)_x000D_
}
_x000D_
Here's all the options you have:
for...of
(ES2015)var dictionary = {_x000D_
"data": [_x000D_
{"id":"0","name":"ABC"},_x000D_
{"id":"1","name":"DEF"}_x000D_
],_x000D_
"images": [_x000D_
{"id":"0","name":"PQR"},_x000D_
{"id":"1","name":"xyz"}_x000D_
]_x000D_
};_x000D_
_x000D_
for (const entry of dictionary.data) {_x000D_
console.log(JSON.stringify(entry))_x000D_
}
_x000D_
Array.prototype.forEach
(ES5)var dictionary = {_x000D_
"data": [_x000D_
{"id":"0","name":"ABC"},_x000D_
{"id":"1","name":"DEF"}_x000D_
],_x000D_
"images": [_x000D_
{"id":"0","name":"PQR"},_x000D_
{"id":"1","name":"xyz"}_x000D_
]_x000D_
};_x000D_
_x000D_
dictionary.data.forEach(function(entry) {_x000D_
console.log(JSON.stringify(entry))_x000D_
})
_x000D_
for()
(ES1)var dictionary = {_x000D_
"data": [_x000D_
{"id":"0","name":"ABC"},_x000D_
{"id":"1","name":"DEF"}_x000D_
],_x000D_
"images": [_x000D_
{"id":"0","name":"PQR"},_x000D_
{"id":"1","name":"xyz"}_x000D_
]_x000D_
};_x000D_
_x000D_
for (let i = 0; i < dictionary.data.length; i++) {_x000D_
console.log(JSON.stringify(dictionary.data[i]))_x000D_
}
_x000D_
var dictionary = {
"data":[{"id":"0","name":"ABC"}, {"id":"1","name":"DEF"}],
"images": [ {"id":"0","name":"PQR"},"id":"1","name":"xyz"}]
};
for (var key in dictionary) {
var getKey = dictionary[key];
getKey.forEach(function(item) {
console.log(item.name + ' ' + item.id);
});
}
Using for and foreach loop
var dictionary = {
data: [{ id: "0", name: "ABC" }, { id: "1", name: "DEF" }],
images: [{ id: "0", name: "PQR" }, { id: "1", name: "xyz" }]
};
dictionary.data.forEach(item => {
console.log(item.id + " " + item.name);
});
for (var i = 0; i < dictionary.data.length; i++) {
console.log(dictionary.data[i].id + " " + dictionary.data[i].name);
}
There's this way too (new to EcmaScript5):
dictionary.data.forEach(function(item){
console.log(item.name + ' ' + item.id);
});
Same approach for images
for(index in dictionary) {
for(var index in dictionary[]){
// do something
}
}
Use dot notation and/or bracket notation to access object properties and for
loops to iterate arrays:
var d, i;
for (i = 0; i < dictionary.data.length; i++) {
d = dictionary.data[i];
alert(d.id + ' ' + d.name);
}
You can also iterate arrays using for
..in
loops; however, properties added to Array.prototype
may show through, and you may not necessarily get array elements in their correct order, or even in any consistent order.
Something like that:
var dictionary = {"data":[{"id":"0","name":"ABC"},{"id":"1", "name":"DEF"}], "images": [{"id":"0","name":"PQR"},{"id":"1","name":"xyz"}]};
for (item in dictionary) {
for (subItem in dictionary[item]) {
console.log(dictionary[item][subItem].id);
console.log(dictionary[item][subItem].name);
}
}
Source: Stackoverflow.com