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/* | |
* | |
* Wikipedia: | |
* | |
* The final digit of a Universal Product Code is a check digit computed as follows: | |
* | |
* 1) Take digits up to but not including the check digit. | |
* 2) Sum the digits in the odd-numbered positions (first, third, fifth, etc.) together and multiply by three. | |
* 3) Add the sum of digits in the even-numbered positions (0th, 2nd, 4th, 6th, etc.) to the result. | |
* 4) Take result modulo 10 |
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def inrange( maxx, maxy ): | |
def func( point ): | |
x,y = point | |
return x >= 0 and x <= maxx and y >= 0 and y <= maxy | |
return func | |
class Game: | |
def __init__(self): | |
self.board = [ |
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const express = require('express') | |
const app = express() | |
const HOST = 'localhost' | |
const PORT = 8000 | |
function hello( req, res ) { | |
const msg = `Use curl http://${HOST}:${PORT}/upload --upload-file <somefile>` | |
res.send(msg) | |
res.end() |
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import React, { useState } from 'react' | |
import './App.css' | |
function Cell( props ) { | |
const [ state, setState ] = useState( props.alive ) | |
return <td class={ props.alive ? 'alive' : 'dead' }>r{props.row}c{props.col}</td> | |
} | |
function Table( props ) { |
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!/bin/bash | |
# | |
# Put this script into ~/.githooks/pre-push and make it executable. | |
# Then run git config -add core.githooks ~/.gitconfig | |
# | |
# You could also put it into .git/hooks for a particular repo | |
# and skip the git config step | |
# | |
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let tree = { | |
'0': { | |
'1': { | |
'3': null, | |
'4': null }, | |
'2': { | |
'5': null, | |
'6': null } | |
} | |
} |
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function toString( rows ) { | |
return rows | |
.map( row => row | |
.map( cell => cell.value ? '1' : '0' ) | |
.join( ' ' ) | |
).join("\n") | |
} | |
class Game { |
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# | |
# Coding challenge that took me well over an hour for a one-hour limi. | |
# I started by overbuilding. Lesson learned is - do minimum viable | |
# for interview coding challenges! | |
# | |
# Sigh. | |
# | |
# Challenge is to parse a string representing an arithmetic expression | |
# and evaluate it without using eval() | |
# |
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Coding challenge. | |
Create a DataCapture class that queries statistics about an input stream of numbers. | |
Assume that the input stream consists of positive integers in the range 0 to 1000. | |
Class must implement the following methods: | |
add(n) - add an input element to collection in O(1) time | |
build() - create summary information on the collection in O(log(n)) time |
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curl --header "Authorization: bearer <your-github-api-token-here>" https://api.github.com/graphql \ | |
-d '{"query":"query { viewer { login } }"}' |
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