57 lines
1.2 KiB
JavaScript
57 lines
1.2 KiB
JavaScript
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'use strict'
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var testValue = require('test-value')
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/**
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* @module reduce-extract
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*/
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module.exports = extract
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/**
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Removes items from `array` which satisfy the query. Modifies the input array, returns the extracted.
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@param {Array} - the input array, modified directly
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@param {any} - if an item in the input array passes this test it is removed
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@alias module:reduce-extract
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@example
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> DJs = [
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{ name: "Trevor", sacked: true },
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{ name: "Mike", sacked: true },
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{ name: "Chris", sacked: false },
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{ name: "Alan", sacked: false }
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]
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> a.extract(DJs, { sacked: true })
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[ { name: 'Trevor', sacked: true },
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{ name: 'Mike', sacked: true } ]
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> DJs
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[ { name: 'Chris', sacked: false },
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{ name: 'Alan', sacked: false } ]
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*/
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function extract (query) {
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var toSplice = []
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var extracted = []
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return function (prev, curr, index, array) {
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if (prev !== extracted) {
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if (testValue(prev, query)) {
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extracted.push(prev)
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toSplice.push(index - 1)
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}
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}
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if (testValue(curr, query)) {
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extracted.push(curr)
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toSplice.push(index)
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}
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if (index === array.length - 1) {
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toSplice.reverse()
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for (var i = 0; i < toSplice.length; i++) {
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array.splice(toSplice[i], 1)
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}
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}
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return extracted
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}
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}
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