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47 lines
1.4 KiB
Lua
47 lines
1.4 KiB
Lua
local Observable = require "rx.observable"
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local util = require "rx.util"
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--- Returns a new Observable that produces a single boolean value representing whether or not the
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-- specified value was produced by the original.
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-- @arg {*} value - The value to search for. == is used for equality testing.
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-- @returns {Observable}
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function Observable:contains(value)
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return Observable.create(function(observer)
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local subscription
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local function onNext(...)
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local args = util.pack(...)
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if #args == 0 and value == nil then
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observer:onNext(true)
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if subscription then
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subscription:unsubscribe()
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end
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return observer:onCompleted()
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end
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for i = 1, #args do
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if args[i] == value then
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observer:onNext(true)
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if subscription then
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subscription:unsubscribe()
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end
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return observer:onCompleted()
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end
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end
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end
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local function onError(e)
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return observer:onError(e)
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end
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local function onCompleted()
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observer:onNext(false)
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return observer:onCompleted()
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end
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subscription = self:subscribe(onNext, onError, onCompleted)
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return subscription
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end)
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end
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