{
var something;
//I'm the global scope
if (something) {
//Im in a block scope
}
var obj = {
//I'm also in a block scope
func() {
//Any function scope is also a block scope
},
attr: {
//hey, I'm in a block scope in a block scope!
}
};
}
{
if(false) //this isn't run... or is it?
{
var bob = 'bob'
}
bob = 'joe' //this should not work because var bob should never be declared
return bob;
}
{
var insecureUserIsLoggedIn = false;
var insecureUserIsLoggedIn = true;
return insecureUserIsLoggedIn
}
{
if(false) {
let bob = 'bob'
}
bob='joe'
return bob
}
{
let bob = 'bob'
let bob = 'joe'
return bob
}
{
const str = 'constant'
str = 'bob'
return str
}
One platform to build and deploy the best data apps
Experiment and prototype by building visualizations in live JavaScript notebooks. Collaborate with your team and decide which concepts to build out.
Use Observable Framework to build data apps locally. Use data loaders to build in any language or library, including Python, SQL, and R.
Seamlessly deploy to Observable. Test before you ship, use automatic deploy-on-commit, and ensure your projects are always up-to-date.