Created
June 11, 2013 16:34
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Helper functions in JavaScript
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/** | |
* hasNestedProperties check if an object has the nested | |
* properties passed in params | |
* | |
* @param {Object} obj object we want to test | |
* @param {String} properties nested property we want | |
* @return {Boolean} either the object has these | |
* nested properties or not | |
*/ | |
function hasNestedProperties(obj, properties) { | |
var properties = properties.split('.'); | |
var property; | |
// For each properties, check if it's an object property | |
for(var i = 0, l = properties.length; i < l; i++) { | |
property = properties[i]; | |
if(!obj.hasOwnProperty(property)) { | |
return false; | |
} | |
obj = obj[property]; | |
} | |
return true; | |
} | |
/** | |
* Use cases: | |
var jSnow = { | |
name: { | |
firstname: 'Jon', | |
lastname: 'Snow' | |
} | |
}; | |
var firstName = hasNestedProperties(jSnow, 'name.firstname'); // = true | |
var familyName = hasNestedProperties(jSnow, 'name.familyName'); // = false | |
var deepNested = hasNestedProperties(jSnow, 'someRandom.property.unexistent'); // = false | |
* It avoids syntax like: | |
if(jSnow.name && jSnow.name.firstname && jSnow.name.firstname.whatever && ...) { | |
console.log(jSnow.name.firstname.whatever); | |
} | |
*/ |
christophehurpeau
commented
Feb 10, 2015
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