I am trying to create a multi dimensional table like so
answers = {}
for i = 1, #answers do
answers[i] = { wrong = t[i], wrong2 = t2[i], right = t3[i]}
end
print(answers[1].wrong)
But when I try to access answers[1].wrong, I get error: attempt to index field '?' (nil value)
But when I do it this way it prints it for me
answers = {
{wrong = t[1], wrong2 = t2[1],right = t3[1]},
{wrong = t[2], wrong2 = t2[2],right = t3[2]}
}
print("----------")
print(answers[1].wrong)
print(answers[1].wrong2)
Why is the first method not working?
answers = {}
for i = 1, #answers do
#answers is 0. So the loop won't execute. You probably meant #t or something.
Related
I would like to know if it was possible to retrieve the attribute of a table in the same array. For example here I want to retrieve the "list.index" attribute of my array, how to do?
{
category_title = "Weapon",
description = nil,
type = "list",
list = {items = {"Give", "Remove"}, index = 1},
style = {},
action = {
onSelected = function()
if list.index == 1 then
-- it's 1
else
-- it's 2
end
end
},
It's not possible to use an entry in another entry when the table is being created.
But since you're defining a function, you can do this:
onSelected = function(self)
if self.list.index == 1 then
-- it's 1
else
-- it's 2
end
end
Just make sure you call onSelected with the table as an argument.
Alternatively, you may set the function after constructing the table in order to be able to access the table as an upvalue (as opposed to leveraging table constructors):
local self = {
categoryTitle = "Weapon",
description = nil,
type = "list",
list = {items = {"Give", "Remove"}, index = 1},
style = {},
action = {}
}
function self.action.onSelected()
if self.list.index == 1 then
-- it's 1
else
-- it's 2
end
end
That way, you get self as an upvalue and don't need to pass it as an argument.
In this code:
t = {
num = '',
}
t[0].num = '0'
t[1].num = '1'
t[2].num = '2'
Is there a way for me to delete t[0], then shift all of the table's values down, so that afterword it looks like this:
t[0].num = '1'
t[1].num = '2'
Example with imaginary functions:
t = {
num = '',
}
t[0].num = '0'
t[1].num = '1'
t[2].num = '2'
for i=0,tableLength(t) do
print(t[i])
end
--Output: 012
remove(t[0])
for i=0,tableLength(t) do
print(t[i])
end
--Output: 12
t = {
num = '',
}
t[0].num = '0'
t[1].num = '1'
t[2].num = '2'
This code will cause errors for indexing t[0], a nil value.
t only has one field and that is t.num
You need to do something like this:
t = {}
for i = 0, 2 do
t[i] = {num = tostring(i)}
end
if you want to create the desired demo table.
As there are many useful functions in Lua that assume 1-based indexing you I'd recommend starting at index 1.
local t = {1,2,3,4,5}
Option 1:
table.remove(t, 1)
Option 2:
t = {table.unpack(t, 2, #t)}
Option 3:
t = table.move(t, 2, #t, 1, t)
t[#t] = nil
Option 4:
for i = 1, #t-1 do
t[i] = t[i+1]
end
t[#t] = nil
There are more options. I won't list them all. Some do it in place, some result in new table objects.
As stated in this answer, by creating a new table using the result of table.unpack:
t = {table.unpack(t, 1, #t)}
Going blind here.. I can't understand why these 2 strings are not equal.. When I puts them to the terminal they are both class string and when I just compare the output they ARE equal. But somehow in my code they are not.. I can't figure out why.
Here is my Ruby code:
def prep_for_duplicate_webhook
#redis_cart = Redis.new
cart_stamp_saved = #redis_cart.get("cart_stamp_saved")
if cart_stamp_saved.nil?
cart_stamp_saved = {}
cart_stamp_saved[:token] = cart_params['token']
cart_stamp_saved[:updated_at] = cart_params['updated_at']
#redis_cart.set("cart_stamp_saved", cart_stamp_saved.to_json)
end
#cart_stamp_incoming = {}
#cart_stamp_incoming["token"] = cart_params['token']
#cart_stamp_incoming["updated_at"] = cart_params['updated_at']
end
def duplicate_webhook?
prep_for_duplicate_webhook
#cart_stamp_saved = redis_cart.get("cart_stamp_saved")
cart_stamp_saved == cart_stamp_incoming.to_json
end
And then the hash's I'm comparing are these two:
cart_stamp_saved = {"token"=>"4a093432ba5c430dd545b16c0e89f187",
"updated_at"=>"2017-02-17T15:27:22.923Z"}
cart_stamp_incoming= {"token"=>"4a093432ba5c430dd545b16c0e89f187",
"updated_at"=>"2017-02-17T15:27:22.923Z"}
If I just copy and paste the above into a new page, and the do this, the response is true
pp cart_stamp_saved == cart_stamp_incoming.to_json
What am I missing?
I want to use Bing search results for my webpage. To use their json data I found this solution:
new_bing_results = bing_results[0][:Web]
result = { }
result[:title] = new_bing_results[0][:Title]
result[:description] = new_bing_results[0][:Description]
result[:url] = new_bing_results[0][:Url]
result[:display_url] = new_bing_results[0][:DisplayUrl]
result[:title1] = new_bing_results [1][:Title]
result[:description1] = new_bing_results [1][:Description]
result[:url1] = new_bing_results [1][:Url]
result[:display_url1] = new_bing_results [1][:DisplayUrl]
result[:title2] = new_bing_results [2][:Title]
result[:description2] = new_bing_results [2][:Description]
result[:url2] = new_bing_results [2][:Url]
result[:display_url2] = new_bing_results [2][:DisplayUrl]
....
result
How can I create a loop that is doing the same thing 50 times without having to repeat the same code.
I tried this but only get errors:
new_bing_results = bing_results[0][:Web]
$i = 0
$num = 50
result2 = {}
while $i < $num do
result[:title$i] = new_bing_results[$i][:Title]
......
end
result
The problem is that I do not find a solution for adding my $i number to the key result[:title] as in the value new_bing_results[$i][:Title]
This should do the trick
result = {}
50.times do |i|
result["title#{i}".to_sym] = new_bing_results[i][:Title]
result["description#{i}".to_sym] = new_bing_results[i][:Description]
result["url#{i}".to_sym] = new_bing_results[i][:Url]
result["display_url#{i}".to_sym] = new_bing_results[i][:DisplayUrl]
end
50.times will run from 0 to 49 and you can use interpolation to avoid the repetition.
You can use .to_sym method. For example:
new_bing_results = [{Title: "Title"}]
result = {}
result["title#{i}".to_sym] = new_bing_results[i][:Title]
result
=> {:title0=>"Title"}
You can use string interpolation and then the to_sym method.
result = {}
50.times do |n|
result["title#{n}".to_sym] = new_bing_results[n][:Title]
end
select
b.security_type,
b.symbol,
b.security_description,
b.trade_date_qty as 'axys_qty',
c.trade_date_qty as 'fidelity_qty',
c.trade_date_qty - b.trade_date_qty as 'qty_diff',
b.cost_basis as 'axys_cost',
c.cost_basis as 'fidelity_cost',
c.cost_basis - b.cost_basis as 'cost_diff'
from
account a
inner join advent_position b on a.fixed_account_number = b.account_number
inner join fidelity_position c on a.fixed_account_number = c.account_number and b.symbol = c.symbol
where
b.account_number = '636296651'
Basically, I have the ff. domains: Account, AdventPosition, FidelityPosition. I haven't set the relationship yet. I'm just wondering if there's a way to replicate the logic above using Criteria or HQL. Forgive me, I'm still new to Grails.
Thank you for any leads on this.
It'd be something close to this:
String hql = '''
select
b.securityType,
b.symbol,
b.securityDescription,
b.tradeDateQty,
c.tradeDateQty,
c.tradeDateQty - b.tradeDateQty,
b.costBasis,
c.costBasis,
c.costBasis - b.costBasis
from
Account a, AdventPosition b, FidelityPosition c
where
a.fixedAccountNumber = b.accountNumber
and a.fixedAccountNumber = c.accountNumber
and b.symbol = c.symbol
and b.accountNumber = :accountNumber
'''
def accountNumber = '636296651'
def results = Account.executeQuery(hql, [accountNumber: accountNumber])
The results will be an ArrayList of Object[], so you can iterate it with something like
for (row in results) {
def securityType = row[0]
def symbol = row[1]
def securityDescription = row[2]
def axys_qty = row[3]
def fidelity_qty = row[4]
def qty_diff = row[5]
def axys_cost = row[6]
def fidelity_cost = row[7]
def cost_diff = row[8]
}
I replaced the hard-coded account number with a named parameter; you can use regular ? like in SQL if you prefer and run 'def results = Account.executeQuery(hql, [accountNumber])', and of course if you intented it to be hard-coded then restore that and don't pass in the 2nd parameter, just run 'def results = Account.executeQuery(hql)'
just sharing the solution that I came up (while waiting for an answer :P) but note that the previous answer is way much better and faster:
def acc = Account.findByFixedAccountNumber('636296651')
List advPos = AdventPosition.findAllByAccountNumber('636296651')
List fidPos = advPos.collect {
FidelityPosition.findAllByAccountNumberAndSymbol('636296651', it.symbol)
}
def item = [:]
def res = []
def limit = advPos.size() - 1
for(i in 0..limit){
item.security_type = advPos[i].securityType
item.symbol = advPos[i].symbol
item.security_description = advPos[i].securityDescription
item.axys_qty = advPos[i].tradeDateQty
item.fidelity_qty = fidPos[i].tradeDateQty
item.qty_diff = item.fidelity_qty - item.axys_qty
item.axys_cost = advPos[i].costBasis
item.fidelity_cost = fidPos[i].costBasis
item.cost_diff = item.fidelity_cost - item.axys_cost
res.add(item)
}