On Wed, Mar 21, 2018 at 11:02 AM, Rodrigo <[email protected]> wrote:
> My proposal is to keep it simple and implement the if-assignment `if(
> const o = ...; ! o ) { ... }` mimicking the `for(;;)` assignment
> behavior.
>
Fair enough. If the assignment is separate from the condition, then none
of that matters.
That question only pertained to let/const declarations used for their value.
That way we can scope a variable to the `if` block and we can do that
> *separately* from assignment.
>
> Assigning and comparing at the same time opens up all sort of oddities
> as the variable transitions from lvalue to comparison operand. This
> already exists in the language and is definitely not good practice.
>
> `if.value`, as proposed earlier is a bombshell similar to `this`,
> which could easily get scrambled with the introduction of additional
> `if` blocks.
>
> The beauty of `if(;)` is that it makes scope blocks possible while
> avoiding the asymmetric behavior caused by assigning and comparing in
> one go.
>
> if( let people=getTeamArray(); people.length > 2 ) {
> console.log("it's a crowd", people.join(','));
> }
> else if( people.length == 2 ) {
> console.log("just a pair");
> }
> else if( people.length == 1 {
> console.log("solo");
> }
> else {
> console.log("none");
> }
>
IIUC, it sounds like the right side could be syntactic sugar for the left
side.
If that's right, what about the left side warrants new syntax to enable the
right?
CurrentProposed
{
*let people = getTeamArray();*
if( people.length > 2 ) {
console.log("it's a crowd", people.join(','));
}
else if( people.length == 2 ) {
console.log("just a pair");
}
else if( people.length == 1 {
console.log("solo");
}
else {
console.log("none");
}
}
if( *let people = getTeamArray();* people.length > 2 ) {
console.log("it's a crowd", people.join(','));
}
else if( people.length == 2 ) {
console.log("just a pair");
}
else if( people.length == 1 {
console.log("solo");
}
else {
console.log("none");
}
I can imagine that it might be nice when used later in an else-if chain:
if (c0) {
...
} else (let x = v1, c1(x)) {
...
} else ...
vs
if (c0) {
...
} else {
let x = v1;
if (c1(x)) {
...
} else ...
}
Can you point at any particularly tricky code that could be simplified by
this?
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