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Una Javera en JS
Esther Lozano
@esloho
Consejos para node sesperar en el intento
Hola JS!
Asincronía
MIND THE (TIME) GAP
Asincronía
Paralelismo
Asincronía
t
t
Hilo 1
Hilo 2
Asincronía y concurrencia
Event Loop
Proceso 1
Proceso 2
Asincronía
Callback hell
Callback hell
Promesas
Promesas
Promesas
Promesas
async - await
Ámbitos
Ámbitos
Ámbitos
Compiler
Engine
Scope
Ámbitos
var a = 2
Compiler: Hey! ¿Tienes una a en
este scope?
Scope: Sip!
Compiler: Chachi!
Fase de generación de código
Ámbitos
var a = 2
Compiler: Hey! ¿Tienes una a en
este scope?
Scope: No sé de qué me hablas...
Compiler: Vete creando una
entonces ;)
Fase de generación de código
Ámbitos
var a = 2
Engine: Hey! ¿Tienes una a en este
scope?
Scope: Mmm… aquí no encuentro
nada
Engine: Vaya… ¿y en algún otro
sitio?
Fase de ejecución
Scope: ¡La encontré!
Engine: Yuju! Pues le voy poniendo
valor 2
Ámbitos
var a = 2
Engine: Hey! ¿Tienes una a en este
scope?
Scope: Mmm… aquí no encuentro
nada
Engine: Vaya… ¿y en algún otro
sitio?
Fase de ejecución
Scope: Ni aquí ni en Júpiter, no
insistas
Engine: Whaaaaaaaat…?
Ámbitos
Ámbitos
a = 2 // Asignación implícita de parámetro
Ámbitos
Hoisting
// 2
// undefined
Hoisting
Closures
Closures
Closures
Closures
“1”
“2”
“3”
“4”
“5”
“6”
“6”
“6”
“6”
“6”
Closures
Closures
WTF is this…?
WTF is this…?
Default binding
Implicit binding
Explicit binding
New binding
WTF is this…?
WTF is this…?
WTF is this…?
No sin mis tipos
Cuenta con mi arco!
Más madera
● Spread
● Rest
Más madera
● Default parameter values
Más madera
● Default value expressions
Más madera
● Destructuring
Más madera
● Interpolated expressions
Más madera
● for … in / for… of
Referencias
● You Don’t Know JS https://github.com/getify/You-Dont-Know-JS
● Documentación Typescript y playground http://www.typescriptlang.org/
● Compilador en línea Babel https://babeljs.io/repl/
● Tutoriales https://nodeschool.io/#workshoppers
● Pa las risas https://www.destroyallsoftware.com/talks/wat
Esther Lozano
@esloho
¿Preguntas?
esloho@gmail.com

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Una Javera en JS: consejos para [node]sesperar en el intento