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33 lines
985 B
Lua
33 lines
985 B
Lua
local Observable = require "rx.observable"
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--- Returns a new Observable that produces values computed by extracting the given keys from the
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-- tables produced by the original.
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-- @arg {string...} keys - The key to extract from the table. Multiple keys can be specified to
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-- recursively pluck values from nested tables.
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-- @returns {Observable}
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function Observable:pluck(key, ...)
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if not key then
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return self
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end
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if type(key) ~= "string" and type(key) ~= "number" then
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return Observable.throw("pluck key must be a string")
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end
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return Observable.create(function(observer)
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local function onNext(t)
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return observer:onNext(t[key])
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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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return observer:onCompleted()
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end
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return self:subscribe(onNext, onError, onCompleted)
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end):pluck(...)
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end
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