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Probando Runkit

node v10.24.1
version: 1.0.0
endpointsharetweet
//Escribiendo en la consola console.log("hola")
typeof(23)
typeof({})
"Trabajando con la versión de node"+ process.version
require("roman-numeral").convert(2020)
number
v=23; console.log(v); typeof(v);
v*3+2.34
v*3+2.34/1.34
27%5
Math.PI+Math.log(123)/2.1+Math.sin(23)
String
v="hola"; console.log(v); typeof(v);
console.log(v.length); v+ "Mundo"
Array: lista indexada de elementos
v=[1,2,4,"str",[3]]; console.log(v) typeof(v)
v[2]
Iteracion de un array for
for(var i =0; i<v.length; i++){ // console.log(i,v[i]); console.log(""+i+"->"+v[i]); }
Usando map
a= [1,3,7,4,8,54]; a.map(Math.sqrt)
Boolean
v = true console.log(v); typeof(v);
v && false || ! v
Object
v={} v={prop1:"valor1", prop2:"valor2", prop3:"valor3"}
v.prop1 v [prop2]
Function
v= function(x){ console.log("ejecutando funcion con argumento" +x); return 2*x; } console.log(v); typeof(v);
v(12)
Undefined
var z console.log(z); typeof(z);
Null
var n = null console.log(n); typeof(n);
Interpretación lógica de cada tipo
var u v= [1,"str",false,[],[23],{},{prop1:2},Math.sqrt,null,u] console.log(v) for(var i=0; 1<v.length; i++){ console.log(i+"->"+v[i]+"Es interpretado logicamente como"+!!v[i]); }
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