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How can I add new array elements at the beginning of an array in JavaScript?
I have a need to add or prepend elements at the beginning of an array. For example, if my array looks like below: [23, 45, 12, 67] And the response from my AJAX call is 34, I want the updated array to be like the following: [34, 23, 45, 12, 67] Currently I am planning to do it like this: var newArray = []; newArray.push(response); for (var i = 0; i < theArray.length; i++) { newArray.push(theArray[
Convert string with commas to array
How can I convert a string to a JavaScript array? Look at the code: var string = "0,1"; var array = [string]; alert(array[0]); In this case alert shows 0,1. If it where an array, it would show 0. And if alert(array[1]) is called, it should pop-up 1 Is there any chance to convert such string into a JavaScript array?
How do I convert a String object into a Hash object?
I have a string which looks like a hash: "{ :key_a => { :key_1a => 'value_1a', :key_2a => 'value_2a' }, :key_b => { :key_1b => 'value_1b' } }" How do I get a Hash out of it? like: { :key_a => { :key_1a => 'value_1a', :key_2a => 'value_2a' }, :key_b => { :key_1b => 'value_1b' } } The string can have any depth of nesting. It has all the properties how a valid Hash is typed in Ruby.
What does a double * (splat) operator do
Have you seen a function declared like this? def foo a, **b ... end I understand that a single * is the splat operator. What does ** mean?
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