26 lines
617 B
JavaScript
26 lines
617 B
JavaScript
//! adapted for mithril from flyd https://github.com/paldepind/flyd
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"use strict"
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var combine = require("../stream").combine
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module.exports = function (tuples, seed) {
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var streams = tuples.map(function (tuple) {
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var stream = tuple[0]
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if (stream._state.state === 0) stream(undefined)
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return stream
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})
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var newStream = combine(function () {
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var changed = arguments[arguments.length - 1]
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streams.forEach(function (stream, idx) {
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if (changed.indexOf(stream) > -1) {
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seed = tuples[idx][1](seed, stream._state.value)
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}
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})
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return seed
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}, streams)
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return newStream
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}
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