CODEWITHSUNDEEP
javascriptjqueryhashset
user1788115
user1788115

Reputation: 81

Check if element is in hashset

How can I check whether a hashset contains a particular value or not in javascript? I have tried the following which is not working:

if (hashset.contains(finalDate)) {
    alert("inside if");
}

My js code:

$.each(cdata.lines, function(idx, line){
    // line.hashsetvariable is my hashset which contain all dates and 
    // let finaldate is 2012-19-12 
    // I want to check this date in my hashset.
}

Upvotes: 2

Views: 5203

Answers (1)

Minko Gechev
Minko Gechev

Reputation: 25682

If the hash set you mean is an object (or hash...) then you can check whether it contains a key by:

var hash = { foo: 'bar', baz: 'foobar' };
'foo' in hash;

If you look for particular value:

function containsValue(hash, value) {
    for (var prop in hash) {
        if (hash[prop] === value) {
            return true;
        }
        return false;
    }
}

If you want to do something more "global" (I don't recommend!) you can change Object's prototype like:

Object.prototype.containsValue = function (value) {
    for (var prop in this) {
        if (this[prop] === value) {
            return true;
        }
    }
    return false;
}

In this case:

var test = { foo: 'bar' };
test.containsValue('bar'); //true
test.containsValue('foobar'); //false

Upvotes: 3

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