My object look like this
{
Key1: true,
Key2: false,
Key3: false,
Key4: true
}
How to save the Keys which are true in an Array like this:
["Key1", "Key4"]
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4 Answers
You could filter the keys.
var object = { Key1: true, Key2: false, Key3: false, Key4: true },
trueKeys = Object.keys(object).filter(k => object[k]);
console.log(trueKeys);2 Comments
hindmost
I would suggest not using implicit type-casting. Use strict comparison instead:
filter(k => object[k] === true). It will only catch true values.
Nina Scholz
op has only
true/false values. why strict comparison if truty works?You can get keys with Object.keys() and then use filter()
var obj = {
Key1: true,
Key2: false,
Key3: false,
Key4: true
}
var keys = Object.keys(obj).filter(e => obj[e] === true);
console.log(keys)
Comments
var keys = {
Key1: true,
Key2: false,
Key3: false,
Key4: true
}
var filteredKeys = [];
for(var key in keys) {
if(keys[key] == true) {
filteredKeys.push(key);
}
}
console.log(filteredKeys);
Comments
Using the filter function.
var myObject = {
Key1: true,
Key2: false,
Key3: false,
Key4: true
}
var myFilteredArray = myObject.keys().filter(function(key) { return myObject[key] }
console.log(myFilteredArray); // ["Key1", "Key4"]
explaination
- myObject.keys() returns the keys of the object as an array.
- The Array filter function receives a function that is executed for each element, if that function returns true, that element is selected. The resulting array is composed of only items that have been "selected"
