week-1.md

Week 1

• Flesch Readability Score is a measure of text readabilty

  • Formula: 206.835 - 1.015 * (# words / # sentences) - 84.6 * (# syllables / # words)

• Interned strings allow Java to treat 2 duplicate strings as the same object in memory.

  String text = new String("Text shiz");  # New object
  String text2 = "Hello world!";  # Refers to the same "interned" object.
  String text3 = "Hello world";  # Refers to the same "interned" object.
  

• Only use == to check equality of objects. Use str1.equals(str2) to compare values (eg in strings).

• String methods in Java:

  • length
  • toCharArray
  • charAt - return character at string position
  • split
  • indexOf

• For each loop in Java:

for (char c : word.toCharArray())
{
    if (c == letter)
    {
        return true;
    }
}

• Regular Expressions:

  • a - match a.
  • a+ - match one or more as.
  • a* - match zero or more as.
  • (ab)+ - match one or more abs.
  • [abc] - match any character inside the set.
  • [a-c] - match any character between a and c.
  • [^a-c] - match anything that's not between a and c.
  • a|c - match a or c.