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Rails ActionMailer - format sender and recipient name/email address
...ully validate or escape the name and email, you can end up with an invalid From header by simply concatenating strings. Here is a safe way:
require 'mail'
address = Mail::Address.new email # ex: "john@example.com"
address.display_name = name.dup # ex: "John Doe"
# Set the From or Reply-To header ...
How to subtract 2 hours from user's local time?
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Subtract from another date object
var d = new Date();
d.setHours(d.getHours() - 2);
Complete reference list for Date object
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Asking the user for input until they give a valid response
I am writing a program that accepts an input from the user.
21 Answers
21
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The purpose of Model View Projection Matrix
...odel, view and projection matrices are three separate matrices. Model maps from an object's local coordinate space into world space, view from world space to camera space, projection from camera to screen.
If you compose all three, you can use the one result to map all the way from object space to ...
In C#, how can I create a TextReader object from a string (without writing to disk)
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StringReader is a TextReader (StreamReader is too, but for reading from streams). So taking your first example and just using it to construct the CsvReader rather than trying to construct a StreamReader from it first gives:
TextReader sr = new StringReader(TextBox_StartData.Text);
using(Csv...
Ruby / Rails: convert int to time OR get time from integer?
...w time object with the given number of seconds (and optional microseconds) from epoch.
API links
ruby-doc.org/core/classes/Time
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How to extract the n-th elements from a list of tuples?
I'm trying to obtain the n-th elements from a list of tuples.
7 Answers
7
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Iterating through a JSON object
...ortunately it's a little hard to explain all the ways you can extract data from lists and dictionaries and strings in the 600 characters you can put in a comment. I already said you should index the dict to get at the value associated with a key. I'm not sure what you want to iterate over. Learning ...
Default function arguments in Rust
...default argument rules).
You could also use an "arguments" struct and the From/Into traits:
pub struct FooArgs {
a: f64,
b: i32,
}
impl Default for FooArgs {
fn default() -> Self {
FooArgs { a: 1.0, b: 1 }
}
}
impl From<()> for FooArgs {
fn from(_: ()) -> ...
Generate all permutations of a list without adjacent equal elements
...tic; it could be reduced to linear (optimal) with better data structures.
from collections import Counter
from itertools import permutations
from operator import itemgetter
from random import randrange
def get_mode(count):
return max(count.items(), key=itemgetter(1))[0]
def enum2(prefix, x,...