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My ES6 implementation of Rails' style #try()
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| // Traverse an object and attempt to extract the value(s) of one | |
| // or more properties, without worrying about non-Object values. | |
| const maybe = (obj, traverse, fields) => { | |
| if (!(fields instanceof Array)) { | |
| fields = [fields] | |
| } | |
| let result | |
| try { | |
| const leaf = traverse.reduce((memo, prop) => memo[prop], obj) | |
| result = fields.reduce((memo, field) => { | |
| leaf[field].wuut | |
| return { ...memo, [field]: leaf[field] } | |
| }, {}) | |
| } catch(e) {} | |
| return result | |
| } | |
| // Example: | |
| // const foo = { ciao: { what: 'Pizza', where: 'Pisa' } } | |
| // | |
| // maybe(foo, ['ciao'], 'what') -> { what: 'Pizza' } | |
| // maybe(foo, ['ciao'. 'bello'], 'what') -> undefined | |
| // maybe(foo, ['ciao'. 'bello'], ['what', 'where']) -> { what: 'Pizza', where: 'Pisa' } |
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