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35 lines
682 B
JavaScript
35 lines
682 B
JavaScript
'use strict'
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function reduce(json, code) {
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if (/^\w+\s*=>/.test(code)) {
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const fx = eval(code)
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return fx(json)
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}
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if (/yield/.test(code)) {
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const fx = eval(`
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function fn() {
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const gen = (function*(){
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${code.replace(/\\\n/g, '')}
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}).call(this)
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return [...gen]
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}; fn
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`)
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return fx.call(json)
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}
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if ('?' === code) {
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return Object.keys(json)
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}
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if (/^\./.test(code)) {
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const fx = eval(`function fn() { return ${code === '.' ? 'this' : 'this' + code} }; fn`)
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return fx.call(json)
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}
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const fx = eval(`function fn() { return ${code} }; fn`)
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return fx.call(json)
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}
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module.exports = reduce
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