Week 1 - Introduction to the Course

Oct 04, 2016 ../data-structures-optimizing-performance

  • Flesch Reading Ease

    • Score is a measure of text readability
      • Formula: 206.835 - 1.015 * (# words / # sentences) - 84.6 * (# syllables / # words)

  • Interned Strings

    • Allow the language 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.

  • String methods in Java:

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

  • For each loop in Java:

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

  • Regular Expressions primer

    • 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.