In my .NET backend, I am utilizing HasFlag() to handle enum authorization.
Enum Foo {
0: Zero,
1: One,
2: Two,
3: Three,
..
}
5.HasEnum(Foo.One) is falsy because 5 is equal to 3 + 2
6.HasEnum(Foo.One) is truthy because 6 is equal to 3 + 2 + 1
What approach can be taken in JavaScript to achieve the same functionality?
I have a role value that falls within the range of > 0 and < 1048, how can I determine if it contains a role corresponding to 32?
extend global {
interface Number {
isFlagged(flag: number): boolean;
}
}
Object.defineProperty(Array.prototype, 'isFlagged', {
enumerable: false,
writable: false,
configurable: false,
value: function (flag: number) { return (this & flag) === flag; }
});
Object.defineProperty(Number.prototype, 'isFlagged', {
enumerable: false,
writable: false,
configurable: false,
value: function (flag) { return (this & flag) === flag; }
});
document.querySelector("#output").innerHTML = "(3).isFlagged(1) = " + (3).isFlagged(1);
document.querySelector("#output").innerHTML += "<br>(4).isFlagged(1) = " + (4).isFlagged(1);<div id="output"></div>If you are using plain JavaScript, simply remove the declare global and ":number" signature.
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