Javascript a=b=c statements

Question

I searched through the internets but could not find a relevant search criteria so I thought this would be the best place to ask.

I have a JS statement saying

document.location.hash = this.slug = this.sliceHashFromHref(href) 

How does this work??

Answer 1

How does this work??

a = b can be seen as both a statement and an expression.

The result of the expression is b.

In other words,

a = b = c; 

which can be written as

a = (b = c); 

is equivalent to

b = c; a = b; 

Thus your code is equivalent to:

this.slug = this.sliceHashFromHref(href); document.location.hash = this.slug; 

Answer 2

Be aware of the variables scope!!

var A = B = C = 3; //A is local variable while B & C are global variables; var A = 3 , B = 3, C = 3;// A B C are local variables;