Here is a little dictionary experiment: give every letter a number, with A equal to 1 and Z equal to 26, and add up each word. I wanted to see which words landed on multiples of 26. The page carries a big word list right in the HTML. JavaScript walks through it, skips entries containing […]
I came back to the permutations page and gave it a textbox and a button. It is a small improvement, but changing the address every time I want to try a different string gets old. The algorithm is still the same recursive one: pick each character in turn, permute the rest, and collect the completed […]
I made a little equation solver for questions like 1_2_3_4_5=6. The numbers are already there; the puzzle is deciding which operations go in the spaces. The code recursively builds combinations of plus, minus, multiply, and divide, puts each combination between the numbers, and evaluates the result. For the default example, it finds answers such as […]
I have been working through interview-style programming questions and wrote a little page to generate permutations of a string. Give it 1234 and it prints all twenty-four arrangements. The recursive step is pretty simple: choose a character, find all the permutations of what is left, then put the chosen character at the beginning of each […]
I have been playing with the word-finding side of Kindoggle. Shaking up a board is easy enough, but it is nice to find out which words we missed when the time is up. There is a solitaire page too. The PHP solver reads a dictionary into two lookup tables: complete words and all their prefixes. […]
I made another version of the arithmetic practice project. This one lets the calculation code work with a selected operation and difficulty level instead of treating every question the same way. The Calculate object remembers the operation and level. It generates an equation as a string, keeps the two operands, and has a separate method […]
