I have nested objects within an object as such:
var parentObj = {
key1: {
a: true,
b: 2
},
key2: {
a: false,
b: 2
},
key3: {
a: true,
b: 2
}
}
I'm looking to create an array of objects from key values, if one of the values in the nested objects is true, and that also includes the keys as a [key,value] pair as such:
parentobj = [
{
a: true,
b: 2,
c: "key1"
},
{
a: true,
b: 2,
c: "key3"
}
]
Just use a for...in loop, like so:
var myArray = [];
for(var key in parentObj){
var childObj = parentObj[key];
if(childObj.a) {
myArray.push({a: childObj.a, b: childObj.b, c: key });
}
}
First thing to mention here is
Associative arrays do not exist in Javascript
you can see here
In your example "key1" is duplicated so if you want to store like then then you have to use Array for that like if one of the values in the nested objects is true
var parentObj = {
key1: [
{
a: true,
b: 2
},
{
a: false,
b: 2
}
],
key3: [
{
a: true,
b: 2
}
]
};
In that case what you want is done like this !
var parentObj = {
key1: [
{
a: true,
b: 2
},
{
a: false,
b: 2
}
],
key3: [
{
a: true,
b: 2
}
]
};
var myArray = [];
for(var key in parentObj){
var childObj = parentObj[key];
var res = childObj.filter(function(element){
return element.a == true;
});
for(ele in res){
res[ele].c = key;
}
if(res.length > 0){
// if you want any of element having true property
myArray.push(res[0]);
}
}
console.log(myArray);A simple one-line solution: extract keys from the object and iterate over them while creating respective objects and filter out the falsy ones:
var parentObj = {
key1: {
a: true,
b: 2
},
key2: {
a: false,
b: 2
},
key3: {
a: true,
b: 2
}
};
var result = Object.keys(parentObj).map(k => (Object.assign({}, parentObj[k], {c: k}))).filter(({a}) => a);
console.log(result);
