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Object Deep Clone, It might hurt! Beware
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| // Create a big object in this and test the methods and see the results. | |
| // I could not find a good way to deep clone an object. | |
| const o = { | |
| }; | |
| // declarative version with Object assign | |
| // Never use this on big objects! | |
| const deepCloneV1 = o => Object.assign({}, o, Object | |
| .keys(o) | |
| .filter(k => o[k] && typeof o[k] === 'object') | |
| .reduce((acc, k) => { | |
| if (Array.isArray(o[k])) { | |
| acc[k] = [...o[k]]; | |
| return acc; | |
| } | |
| acc[k] = deepCloneV1(o[k]); | |
| return acc; | |
| }, {})); | |
| // imperative plain version | |
| // Never use this on big objects! | |
| function deepCloneV2 (o) { | |
| const newO = {}; | |
| const keys = Object.keys(o); | |
| for (let k, i = 0; i < keys.length; i++) { | |
| k = keys[i]; | |
| if(Array.isArray(o[k])) { | |
| newO[k] = [...o[k]] | |
| } else if (o[k] && typeof o[k] === 'object') { | |
| newO[k] = deepCloneV2(o[k]); | |
| } else { | |
| newO[k] = o[k]; | |
| } | |
| } | |
| return newO; | |
| } | |
| // Plain old stringify method | |
| // Never use this on big objects! | |
| // but best option | |
| const deepCloneV3 = o => JSON.parse(JSON.stringify(o)); |
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