1.2 KiB
1.2 KiB
title |
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Check if an Object has a Property |
Check if an Object has a Property
Method:
- The simplest way to complete this challenge is to create an
ìf-statement
to check wether or not the object contains all useres, then to return a true or false statement. The first solution does just this. - The second solution works in exactly the same way, only it uses 1 line of code -
Conditional(ternary)-Operator
- within the function.
developer.mozilla.org provides a more in depth analysis of the ternary operator.
Solution-1:
let users = {
Alan: {
age: 27,
online: true
},
Jeff: {
age: 32,
online: true
},
Sarah: {
age: 48,
online: true
},
Ryan: {
age: 19,
online: true
}
};
function isEveryoneHere(obj) {
// change code below this line
if(users.hasOwnProperty('Alan','Jeff','Sarah','Ryan')) {
return true;
}
return false;
// change code above this line
}
console.log(isEveryoneHere(users));
Solution-2:
function isEveryoneHere(obj) {
return (users.hasOwnProperty('Alan','Jeff','Sarah','Ryan')) ? true : false;
}