Is there a way to use arrays as values in a javascript Set?
Example:
s = new Set()
s.add([1,2])
s.has([1,2]) // -> false
s.add(1)
s.has(1) // -> true
Presumably, the case with the array returns false because it's looking at the references and not the actual values of the arrays. Is there a way to do this operation so that s.has([1,2]) returns true?
You can use json as key.
s = new Set()
s.add(JSON.stringify([1,2]))
s.has(JSON.stringify([1,2])) // true
tuple which is passed by value rather than reference.You have to be carefull here, cause Set.has compares objects (here arrays) by reference, so it should look like this:
var a = [1,2];
var s = new Set([a]);
s.has(a); // -> true
That will work, but i would wrap Set with my own prototype for not iterating each time through set:
function compareByValue(pool, needle){
var search = [];
pool.forEach(function(value) {
search.push(value.toString());
});
return search.indexOf(needle.toString()) !== -1;
}
compareByValue(s, [1,2]); // -> true
