I have an object like this
const countries = {
iran: {
capital : 'Tehran',
population : '83183741',
area : '1648195'
},
uk: {
capital : 'London',
population : '6708100',
area : '242495'
},
us: {
capital : 'Washington D.C.',
population : '332641717',
area : '9525067'
},
ukraine: {
capital : 'Kyiv',
population : '44983019',
area : '603500'
}
};
How I can get an output like this?
iran,capital,Tehran
iran,population,83183741
iran,area,1648195
uk,capital,Tehran
uk,population,6708100
uk,area,242495
....
ukrane,capital,603500
ukrane,population,41130432
ukrane,area,603500
const countries = {
iran: {
capital : 'Tehran',
population : '83183741',
area : '1648195'
},
uk: {
capital : 'London',
population : '6708100',
area : '242495'
},
us: {
capital : 'Washington D.C.',
population : '332641717',
area : '9525067'
},
ukrane: {
capital : 'Kiev',
population : '41130432 ',
area : '603500'
}
};
var i = 1;
for (const country in countries) {
console.log(country);
for (let x in country) {
console.log(country[x])
}
i++
}You were close. The only thing you've missed is that a for..in loop gives you the key, not the value. So, you have to access the given key on the object like this:
const countries = {
iran: {
capital : 'Tehran',
population : '83183741',
area : '1648195'
},
uk: {
capital : 'London',
population : '6708100',
area : '242495'
},
us: {
capital : 'Washington D.C.',
population : '332641717',
area : '9525067'
},
ukrane: {
capital : 'Kiev',
population : '41130432 ',
area : '603500'
}
};
for (const country in countries) {
console.log(country);
for (const property in countries[country]) {
console.log(countries[country][property])
}
}From there, you can easily concatenate the pieces of information you need:
const countries = {
iran: {
capital : 'Tehran',
population : '83183741',
area : '1648195'
},
uk: {
capital : 'London',
population : '6708100',
area : '242495'
},
us: {
capital : 'Washington D.C.',
population : '332641717',
area : '9525067'
},
ukrane: {
capital : 'Kiev',
population : '41130432 ',
area : '603500'
}
};
for (const country in countries) {
for (const property in countries[country]) {
console.log(`${country},${property},${countries[country][property]}`)
}
}Note that for..in also iterates through key on the prototypes, so you should do extra checks to avoid this. Instead, I recommend using a for..of loop with Object.keys() or Object.entries():
const countries = {
iran: {
capital : 'Tehran',
population : '83183741',
area : '1648195'
},
uk: {
capital : 'London',
population : '6708100',
area : '242495'
},
us: {
capital : 'Washington D.C.',
population : '332641717',
area : '9525067'
},
ukrane: {
capital : 'Kiev',
population : '41130432 ',
area : '603500'
}
};
for (const country of Object.keys(countries)) {
for (const property of Object.keys(countries[country])) {
console.log(`${country},${property},${countries[country][property]}`)
}
}this can be the basic way:
//here we loop to get the countries
for (let country in countries) {
// this will be the index (iran , uk , us , ukrane)
//here we loop into the data of each country
for(let data in countries[country]){
//and we print the result easy as this:
console.log(country + " , " + data + " , " +countries[country][data]);
}
}
Using nested Object.entries
const countries = {
iran: {
capital: "Tehran",
population: "83183741",
area: "1648195",
},
uk: {
capital: "London",
population: "6708100",
area: "242495",
},
us: {
capital: "Washington D.C.",
population: "332641717",
area: "9525067",
},
ukraine: {
capital: "Kyiv",
population: "44983019",
area: "603500",
},
};
Object.entries(countries).forEach(([country, obj]) =>
Object.entries(obj).forEach(([key, value]) =>
console.log([country, key, value].join())
)
);