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@@ -0,0 +1,22 @@
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+const $isset = (flag: number, sequence = 0) => (sequence & flag) === flag
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+const $set = (flag: number, sequence = 0) => sequence | flag
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+const $unset = (flag: number, sequence = 0) => sequence & ~flag
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+const $toggle = (flag: number, sequence = 0) => sequence ^ flag
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+
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+const combine = (flags: number[]) => flags.reduce((flags, flag) => flags + flag, 0)
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+
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+const createMultiFlagHandler = <T>(fn: (flag: number, flags: number) => T) =>
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+ (flag: number | number[], sequence = 0): T =>
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+ fn(Array.isArray(flag) ? combine(flag) : flag, sequence)
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+
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+const set = createMultiFlagHandler($set)
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+const unset = createMultiFlagHandler($unset)
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+const toggle = createMultiFlagHandler($toggle)
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+const isset = createMultiFlagHandler($isset)
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+
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+export {
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+ isset,
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+ set,
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+ unset,
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+ toggle
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+}
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