I have an object with few properties true/false, I need to return an array with only the property name with true.
I have tried Object.entries but not sure how to create an array now.
const inputs = {
a: true,
b: true,
c: false
}
// result should be ['a','b']
// i have tried so far this one with no success
// const result = Object.entries(inputs).map((x, idx) => console.log(x))
Object.keys(inputs).filter(key => inputs[key])
Use the filter array method, described by MDN as
creates a new array with all elements that pass the test implemented by the provided function
Call it on the Object.keys, a built in array for objects:
returns an array of a given object's property names
Source: Object.keys()
So, to put it together, it would look like
const inputs = {
a: true,
b: true,
c: false
}
console.log(inputs); // Output: {a: true, b: true, c: false}
const arr = Object.keys(inputs).filter(keyName => inputs[keyName]);
console.log(arr); // Output: ["a", "b"]
For give only keys of object use filter:
Like this:
const inputs = {
a: true,
b: true,
c: false
};
var true_inputs = Object.keys(inputs).filter(key => inputs[key]);
console.log(true_inputs);Or Jquery map:
const inputs = {
a: true,
b: true,
c: false
};
var true_inputs = $.map(inputs, function(n, i) { if(n) return i });
console.log(true_inputs);<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>For to get the whole object use for .. in:
Like this:
const inputs = {
a: true,
b: true,
c: false
};
var true_inputs = {};
for(var key in inputs){
if(inputs[key])
true_inputs[key]=inputs[key];
}
console.log(inputs);
console.log(true_inputs);
Object.keys(inputs).filter(key => inputs[key]);