initial notes on es6 and ruby/rails

.gitignore

@@ -57,3 +57,6 @@ typings/
 # dotenv environment variables file
 .env
 
+#vi temp files
+*~
+*.swp

js_es6.md

@@ -0,0 +1,67 @@
+### [browser support](http://kangax.github.io/compat-table/es6/)
+
+### [default function parameters](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions/Default_parameters)
+```
+function test(a=1, b={}, c=false){ }
+```
+
+### [rest parameters](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions/rest_parameters)
+```
+function test(a, ...b) {} 
+```
+
+### [spread (...) operator](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Spread_operator)
+```
+test(...a);
+[a, ...b, c];
+```
+
+### [object literal extensions](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Object_initializer)
+```
+var o={a:1, b, c:false};
+```
+
+### [for...of loops](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/for...of)
+```
+for(let q of iterable) { }
+typeof a[Symbol.iterator] == 'function' // check if a is an iterable
+
+// iterable function
+let q = function*() {
+	yield 1;
+	yield 2;
+};
+
+//make an object iterable:
+let q = {
+	a:1, b:2, c:3, d:4,
+	[Symbol.iterator]: function*() {
+		for(let i of Object.keys(this)) yield this[i];
+	}
+};
+```
+
+### [numeric literals](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Lexical_grammar#Numeric_literals)
+```
+// leading 0 with all other numbers 0-7 = octal
+let i = 0754; //decimal 492
+// 0o, 0x, 0b prefix, can also be uppercase
+i = 0o754; // also octal, dec 492
+i = 0x754; // hex, dec 1876
+i = 0b1010100100 // binary, dec 676
+
+// toString - es1 standard
+x = (676).toString(16); // hex of number, in string form
+x = (676).toString(8); // octal
+x = (676).toString(2); // binary
+// works for bases 2 - 36
+```
+
+### [string template literals](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Template_literals)
+```
+let a = `string test ${variable} ${function(a)} ${3+2}`;
+let b = `line 1
+line 2
+	line 3 with tab
+	line 4 with ${varForLine4}`;
+```

ruby_rails_install.md

@@ -0,0 +1,37 @@
+* install rvm
+`\curl -L https://get.rvm.io | bash -s stable --ruby`
+
+* possibly need stuff to sign
+```
+sudo apt-get install gnupg2
+gpg2 --recv-keys ...
+\curl -L https://get.rvm.io | bash -s stable --ruby
+```
+
+* update
+```
+gem update --system
+
+rvm gemset list
+rvm gemset use global
+gem list
+gem outdated
+gem update
+gem install bundler
+gem install nokogiri
+```
+[current version of Rails.](http://rubygems.org/gems/rails)
+```
+rvm use [email protected] --create
+gem install rails
+rails -v
+```
+
+* new rails application
+```
+mkdir myapp
+cd myapp
+rvm use ruby-2.4.1@myapp --ruby-version --create
+gem install rails
+rails new .
+```