associative-array

I need to loop over an associative array and drain the contents of it to a temp array (and perform some update to the value). The leftover contents of the first array should then be discarded and i want to assign the temp array to the original array variable. Sudo code: declare -A MAINARRAY declare -A TEMPARRAY ... populate ${MAINARRAY[...]} ... while something; do #Drain some values from MAINARRAY to TEMPARRAY ${TEMPARRAY["$name"]}=((${MAINARRAY["$name"]} + $somevalue)) done ... other manipulations to TEMPARRAY ... unset MAINARRAY #discard left over values that had no update declare -A

Does Ruby on rails have associative arrays? For eg: a = Array.new a["Peter"] = 32 a["Quagmire"] = 'asdas' What is the easiest method to create such an array structure in Ruby? Unlike PHP which conflates arrays and hashes, in Ruby (and practically every other language) they're a separate thing. http://ruby-doc.org/core/classes/Hash.html In your case it'd be: a = {'Peter' => 32, 'Quagmire' => 'asdas'} There are several freely available introductory books on ruby and online simulators etc. http://www.ruby-doc.org/ newUserNameHere Use hashes, here's some examples on how to get started (all of

This question already has an answer here: How to merge two dictionaries in a single expression? 41 answers How do you calculate the union of two dict objects in Python, where a (key, value) pair is present in the result iff key is in either dict (unless there are duplicates)? For example, the union of {'a' : 0, 'b' : 1} and {'c' : 2} is {'a' : 0, 'b' : 1, 'c' : 2} . Preferably you can do this without modifying either input dict . Example of where this is useful: Get a dict of all variables currently in scope and their values Mechanical snail This question provides an idiom. You use one of the

I'm trying to obtain the first key of an associative array, without creating a temporary variable via array_keys() or the like, to pass by reference. Unfortunately both reset() and array_shift() take the array argument by reference, so neither seem to be viable results. With PHP 5.4 I'll be in heaven; array_keys($array)[0]; , but unfortunately this of course is not an option either. I could create a function to serve the purpose, but I can only imagine there is some concoction of PHP's array_* functions that will produce the desired result in a single statement , that I cannot think of or come

When I create a new javascript array, and use an integer as a key, each element of that array up to the integer is created as undefined. for example: var test = new Array(); test[2300] = 'Some string'; console.log(test); will output 2298 undefined's and one 'Some string'. How should I get javascript to use 2300 as a string instead of an integer, or how should I keep it from instanciating 2299 empty indices? Use an object, as people are saying. However, note that you can not have integer keys. JavaScript will convert the integer to a string . The following outputs 20, not undefined: var test =

If I have a JS associative array which is from what I gather is really an object, and I wish to remove an element, using delete myArr[someId] will set the element to undefined, whilst splice won't work at all... so what is the alternative for an associative array if I wish to delete an element (rather than setting it to undefined ) Geuis The terminology in js can be confusing at first, so lets straighten that out. Yes, pretty much everything in js is an object. However, there are differences in the data types. An array can be used like as associative array, but it's different than an object

I know It's a very basic question but I have to ask. I have an associative array let's say it is: $couple = array('husband' => 'Brad', 'wife' => 'Angelina'); Now, I want to print husband name in a string. There are so many ways but i want to do this way but it gives html error $string = "$couple[\'husband\'] : $couple[\'wife\'] is my wife."; Please correct me if I'm using a wrong syntax for backslash. Your syntax is correct. But, still you can prefer single quotes versus double quotes. Because, double quotes are a bit slower due to variable interpolation. (variables within double quotes are