If i have a JSON object as below:
jsonObj = {key1 :"", key2: "", key3:""}
Is it possible to know that all values are empty using a single function or property of JSON?
I tried jsonObj.length == 0 & also !Object.values(jsonObj).length but that doesnt work.
There is no such function but you can use Object.values and every. Object.values will create an array consisting of object values & every will check if all the value in that array pass the test condition
let jsonObj = {
key1: "",
key2: "",
key3: ""
};
let val = Object.values(jsonObj).every((item) => {
return item === "";
})
console.log(val)Alternatively you can create a function and use for..in to iterate the object. If the value of the key is not "" then return false , else return true
function validateObj(obj) {
for (let keys in obj) {
if (obj[keys] !== "") {
return false;
}
}
return true;
}
let jsonObj = {
key1: "",
key2: "",
key3: ""
};
let jsonObj2 = {
key1: "123",
key2: "",
key3: ""
};
console.log(validateObj(jsonObj));
console.log(validateObj(jsonObj2));If you want to test if the property of every value in a JavaScript object is an empty string, then you need to loop over them and test them.
The simplest way to do that is to convert to an array of values and then filter them.
const object = {
key1: "",
key2: "",
key3: ""
};
const array_of_values = Object.values(object);
const array_of_not_empty_strings = array_of_values.filter( value => value !== "" );
if (array_of_not_empty_strings.length) {
console.log(array_of_not_empty_strings.length + " values were not empty strings");
} else {
console.log("Every value was an empty string");
}Or more concisely:
const object = {
key1: "",
key2: "",
key3: ""
};
console.log(!!Object.values(object).filter( v => v !== "" ).length);You could use Object.keys() and check for .some() to exit as soon as possible from the loop
const jsonObj = {key1 :"", key2: "", key3:""};
const allValsEmpty = !Object.keys(jsonObj).some(k => jsonObj[k] !== "");
console.log(allValsEmpty) // truebasically, as soon the loop encounters a value that is not empty - will stop the iteration.
every() is a better choice.
.every() scenario (that iterates the entire array) - here's just a hard to reason example with an early exit - by using .some(). If some has value... therefore not all are empty. Am I mistaken something?Well there is no direct way to check , But you can check like this :
jsonObj = {key1 :"", key2: "", key3:""}
Object.values(jsonObj).every(el=>el.length === 0)
true for empty arrays [] also, if it's expected Object.values(jsonObj).every(el => !el.length) more compact
jsonObj.length == 0 , thats why i showed with that only , its not about one liner or more obiously it can be written in many ways .