I would like to get variable name of an object which is empty. How can i get this?
My code
var array = [foo, bar, baz]
array.map((el)=>{
if(Object.keys(el).length === 0) {
//give me name of var from an array which is empty
}
})
There's no way to get to a variable name from some arbitrary value. But you can supply meta information yourself. For example:
const foo = {a: 42};
const bar = {};
const baz = {b: 451};
// Use an object, instead of an array. With the following syntax
// the variable *creates* a property of the same name.
const configs = {foo, bar, baz};
// find *empty* elements:
const emptyConfigs = Object.entries(configs).reduce((acc, [k, cfg]) => {
return Object.keys(cfg).length === 0
? [...acc, k]
: acc;
}, []);
console.log(emptyConfigs);Ref: Object initializer
Alternatively include the information with each array entry. Which has the added benefit that the configs can/could be inlined (and thus don't have a name). E.g.:
const foo = {a: 42};
const bar = {};
const baz = {b: 451};
const configs = [
{key: 'foo', cfg: foo},
{key: 'bar', cfg: bar},
{key: 'baz', cfg: baz},
{key: 'unnamed', cfg: {}}, // inlined config
];
const emptyConfigs = configs.reduce((acc, {key, cfg}) => {
return Object.keys(cfg).length === 0
? [...acc, key]
: acc;
}, []);
console.log(emptyConfigs);