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Convert javascript object camelCase keys to underscore_case

rated 0 times [ 36] [ 6] / answers: 1 / hits: 20543 / 9 Years ago, sun, june 21, 2015, 12:00:00

I want to be able to pass any javascript object containing camelCase keys through a method and return an object with underscore_case keys, mapped to the same values.

So, I have this:

var camelCased = {firstName: 'Jon', lastName: 'Smith'}

And I want a method to output this:

{first_name: 'Jon', last_name: 'Jon'}

What's the fastest way to write a method that takes any object with any number of key/value pairs and outputs the underscore_cased version of that object?

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jonrened

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answered 9 Years ago uriahw · Accepted Answer

Here's your function to convert camelCase to underscored text (see the jsfiddle):

function camelToUnderscore(key) {

    return key.replace( /([A-Z])/g, _$1).toLowerCase();

}



console.log(camelToUnderscore('helloWorldWhatsUp'));

Then you can just loop (see the other jsfiddle):

var original = {

    whatsUp: 'you',

    myName: 'is Bob'

},

    newObject = {};



function camelToUnderscore(key) {

    return key.replace( /([A-Z])/g, _$1 ).toLowerCase();

}



for(var camel in original) {

    newObject[camelToUnderscore(camel)] = original[camel];

}



console.log(newObject);