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How can I get the first n (for example 3) elements of an object with underscore?
Thank you!
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Use object. keys(objectName) method to get access to all the keys of object. Now, we can use indexing like Object. keys(objectName)[0] to get the key of first element of object.
Underscore is a JavaScript library that provides a whole mess of useful functional programming helpers without extending any built-in objects.
The dollar sign ($) and the underscore (_) characters are JavaScript identifiers, which just means that they identify an object in the same way a name would. The objects they identify include things such as variables, functions, properties, events, and objects.
http://underscorejs.org/#first
_.first allows you to pass a number to get the first n elements of an array.
_.first([1,2,3], 2) // [1,2]
If by object, you mean associative object, the values are not in any specified order. You could do
_.first(_.values( { 'a' : 5, 'b' : 6, 'c' : 8 }), 2) // [5,6]
but it is not guaranteed that the values you get out will be the 'first' ones, so I'm not sure when that would be useful.
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