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Safely access nested object or array properties in 127 bytes
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| function(obj) { | |
| // First argument is the object to search | |
| // The rest of the arguments are the property names to search for | |
| var args = Array.prototype.slice.call(arguments,1); | |
| // Reduce over all the property names, descending further and further into the search object | |
| // Seed value is the object we're searching | |
| return args.reduce(function(obj, arg) { | |
| // If the current object has the specified value, return it | |
| if (obj !== undefined && obj.hasOwnProperty(arg)) { | |
| return obj[arg]; | |
| // Otherwise return undefined | |
| } else { | |
| return undefined; | |
| } | |
| }, obj); | |
| } |
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| function(o){return[].slice.call(arguments,1).reduce(function(o,a){return o!==undefined&&o.hasOwnProperty(a)?o[a]:undefined},o)} |
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| DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE | |
| Version 2, December 2004 | |
| Copyright (C) 2011 YOUR_NAME_HERE <YOUR_URL_HERE> | |
| Everyone is permitted to copy and distribute verbatim or modified | |
| copies of this license document, and changing it is allowed as long | |
| as the name is changed. | |
| DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE | |
| TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION | |
| 0. You just DO WHAT THE FUCK YOU WANT TO. |
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| { | |
| "name": "safePropertyAccess", | |
| "description": "Safely access properties of a deeply nested object.", | |
| "keywords": [ | |
| "object", | |
| "array", | |
| "traverse" | |
| ] | |
| } |
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| <!DOCTYPE html> | |
| <title>Foo</title> | |
| <div>Expected value: <b>hello</b></div> | |
| <div>Actual value: <b id="ret1"></b></div> | |
| <div>Expected value: <b>undefined</b></div> | |
| <div>Actual value: <b id="ret2"></b></div> | |
| <div>Expected value: <b>9</b></div> | |
| <div>Actual value: <b id="ret3"></b></div> | |
| <div>Expected value: <b>false</b></div> | |
| <div>Actual value: <b id="ret4"></b></div> | |
| <script> | |
| var getVal = function(o){return[].slice.call(arguments,1).reduce(function(o,a){return o!==undefined&&o.hasOwnProperty(a)?o[a]:undefined},o)} | |
| var o = { | |
| aa: { | |
| bb: { | |
| cc: 'hello', | |
| dd: [8, 9, 10] | |
| }, | |
| ee: false | |
| } | |
| }; | |
| document.getElementById('ret1').innerHTML = getVal(o, 'aa', 'bb', 'cc'); | |
| document.getElementById('ret2').innerHTML = getVal(o, 'aa', 'bb', 'kk'); | |
| document.getElementById('ret3').innerHTML = getVal(o, 'aa', 'bb', 'dd', 1); | |
| document.getElementById('ret4').innerHTML = getVal(o, 'aa', 'ee'); | |
| </script> |
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