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I want to extract only certain values ​from an array


By : Diwakar Jha
Date : October 16 2020, 06:10 PM
Hope that helps If you only want the second argument. Then a better way would be split() by ','
Note: This approach will not work for first element. For first element and last element consider the below method.
code :
const arr = ["myEvent(event, 'myId_01',3,'333','10000260','');", "myEvent(event, 'myId_02',3,'abcd','10000260','');"]

let res = arr.map(x => x.split(',')[1].trim());
console.log(res)
const arr = ["myEvent(event, 'myId_01',3,'333','10000260','');", "myEvent(event, 'myId_02',3,'abcd','10000260','');"]

let res = arr.map(x => x.match(/\((.*)\)/)[1].split(/,\s*/)[1]);
console.log(res)


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Storing values from file into array and extract values based on certain number


By : Veni Subbu
Date : March 29 2020, 07:55 AM
I wish this help you First, you probably don't want to use fscanf. Second, you almost certainly don't want to use three separate arrays, if you can possibly help it. If at all possible, you want something like:
code :
struct whatever { 
    int a, b, c;

    friend std::istream &operator>>(std::istream &is, whatever &w) { 
        return is >> w.a >> w.b >> w.c;
    }
};

std::vector<whatever> w;

std:copy_if(std::istream_iterator<whatever>(infile),
            std::istream_iterator<whatever>(),
            std::back_inserter(w),
            [](whatever const &w) { return w.a == 3; } );

Extract key values from one Array object and filter from other objects with the extracted values with underscore javascr


By : Gang
Date : March 29 2020, 07:55 AM
With these it helps You can use pluck to get the array of all the age from myArray. And then you can use filter, to filter the another array based on the age.
Demo
code :
var myArray = [{
  "name": "John Doe",
  "age": 29
}, {
  "name": "Anna Smith",
  "age": 24
}];


var myAnotherArray = [{
  "name": "John Doe",
  "age": 29
}, {
  "name": "Anna Smith",
  "age": 24
}, {
  "name": "Peter Jones",
  "age": 39
}, {
  "name": "Gabby",
  "age": 24
}, {
  "name": "Julian",
  "age": 29
}, {
  "name": "George",
  "age": 39
}];

var ages = _.pluck(myArray, 'age');

var filtered = _.filter(myAnotherArray, function(i, l) {
  return _.contains(ages, i.age);
});
console.log(filtered);
document.write(JSON.stringify(filtered));
<script src="https://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.8.3/underscore-min.js"></script>

PHP use array values to match to keys of another array then extract values into new array


By : user2461978
Date : March 29 2020, 07:55 AM
should help you out , One possibility is to use array_map:
code :
$encoded = array_map(function ($v) use ($encoding) { return $encoding[$v]; }, $value);
Array ( [0] => K [1] => K [2] => B [3] => L )
$decoded = array_map(function ($v) use ($encoding) { return array_search($v, $encoding);}, $encoded);
$encoding_f = array_flip($encoding);
$decoded = array_map(function ($v) use ($encoding_f) { return $encoding_f[$v];}, $encoded);
Array ( [0] => 1 [1] => 1 [2] => 4 [3] => 2 )

Given a hash with an array of values, how to extract numbers of unique values of each key?


By : Ken
Date : March 29 2020, 07:55 AM
may help you . I have a hash that has an array of values for each key: , Below code would work with more than two keys also
code :
h = {
  'a' => ['c', 'b', 'd'],
  'b' => ['c', 'b', 'f', 'g']
}
g={}

all_values = h.values.flatten
uniq_elements = all_values.select{|element| all_values.count(element) == 1 }
h.each do |k,v|
  g[k] = (v & uniq_elements).count
end
g
h = { 'cat' => ['c', 'b', 'd', 'c', 'e', 'f'],
      'dog' => ['c', 'b', 'f', 'g'],
      'pig' => ['h', 'h', 'b', 'f'] }

g={}

all_values = h.values.collect{|val| val.uniq}.flatten
uniq_elements = all_values.select{|element| all_values.count(element) == 1 }
h.each do |k,v|
  g[k] = (v & uniq_elements).count
end
g

php - how to extract values from array with string values with equal = sign without preg_match


By : Jain-user3000947
Date : March 29 2020, 07:55 AM
like below fixes the issue You could let the PHP function parse_str() do the heavy lifting for you but it expects to receive a standard query string, with the entries separated by &. Your input string uses a different separator (|) and parse_str() does not provide a way to tell it what character to use as separator.
The problem has a very simple solution: use str_replace() to replace | to & in the input string then pass the result to parse_str():
code :
$input = 'txn_status=0399|txn_msg=failure|txn_err_msg=Transaction Cancelled : ERROR CODE TPPGE161|clnt_txn_ref=9178|tpsl_bank_cd=NA|tpsl_txn_id=T245107|txn_amt=121.00|clnt_rqst_meta={mob:9937253528}{custname:pawan}|tpsl_txn_time=NA|tpsl_rfnd_id=NA|bal_amt=NA|rqst_token=cd3f6f55-5990-4c3b-bb12-238eede827a0|hash=3cf25909ec73865d3200bc267119d3fcc21df463';
parse_str(str_replace('|', '&', $input), $output);

print_r($output);
Array
(
    [txn_status] => 0399
    [txn_msg] => failure
    [txn_err_msg] => Transaction Cancelled : ERROR CODE TPPGE161
    [clnt_txn_ref] => 9178
    [tpsl_bank_cd] => NA
    [tpsl_txn_id] => T245107
    [txn_amt] => 121.00
    [clnt_rqst_meta] => {mob:9937253528}{custname:pawan}
    [tpsl_txn_time] => NA
    [tpsl_rfnd_id] => NA
    [bal_amt] => NA
    [rqst_token] => cd3f6f55-5990-4c3b-bb12-238eede827a0
    [hash] => 3cf25909ec73865d3200bc267119d3fcc21df463
)
$input = 'txn_status=0399|txn_msg=failure|txn_err_msg=Transaction Cancelled : ERROR CODE TPPGE161|clnt_txn_ref=9178|tpsl_bank_cd=NA|tpsl_txn_id=T245107|txn_amt=121.00|clnt_rqst_meta={mob:9937253528}{custname:pawan}|tpsl_txn_time=NA|tpsl_rfnd_id=NA|bal_amt=NA|rqst_token=cd3f6f55-5990-4c3b-bb12-238eede827a0|hash=3cf25909ec73865d3200bc267119d3fcc21df463';
$output = array_reduce(
    explode('|', $input),
    function($acc, $item) {
        list($key, $value) = explode('=', $item, 2);
        $acc[$key] = $value;
        return $acc;
    },
    []
);

print_r($output);
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