Head First Ruby

Index

A note on the digital index

A link in an index entry is displayed as the section title in which that entry appears. Because some sections have multiple index markers, it is not unusual for an entry to have several links to the same section. Clicking on any link will take you directly to the place in the text in which the marker appears.

Symbols

! (exclamation mark)

!= (not equal to) operator, Conditionals

in naming methods, Method names

" (double quotes), Your first Ruby expressions

(see also ' (single quotes))

#{...} notation inside, String interpolation, Ruby makes working with strings easy

in double-quoted string, Escape sequences in strings

specifying strings using, Your first Ruby expressions

# (hash) mark

at start of method names in documentation, Instance methods denoted with # in the docs

making comments using, Running scripts

% (percent) sign, format sequences, Format sequences

& (ampersand), denoting block parameter to method, Defining a method that takes blocks, Your Ruby Toolbox

&& (and) operator, Conditionals

' (single quotes), Your first Ruby expressions

(see also " (double quotes))

specifying strings using, Your first Ruby expressions

( ) parentheses

using with parameters, Defining methods

with method calls, Method arguments

* (asterisk), multiplication operator, Your first Ruby expressions, “/” is a method

** (exponentiation) operator, Your first Ruby expressions

+ (plus) sign

+= operator, Variables

addition operator, Your first Ruby expressions, “/” is a method

for concatenation, ...