Replacing a variable with function(variable)

Question

Is there a shortcut for

myVar = myFunction(myVar);

?

Similar to myVar+=2; instead of myVar=myVar+2;

Thanks!

It depends on, what transformation, does the function myFunction do? — Sarbbottam
– Sarbbottam, Commented Jul 20, 2014 at 18:20
Get the concepts clearly. myVar = myFunction(myVar); means assigning value to myvar after function returns the value. What you want to do actually? — Vedant Terkar
– Vedant Terkar, Commented Jul 20, 2014 at 18:21
No, there is no such shortcut. If you want to mutate objects though, you might use a method call for this. — Bergi
– Bergi, Commented Jul 20, 2014 at 19:02

apsillers · Accepted Answer · 2014-07-20 18:22:44Z

3

No, no such expression exists. If we examine ECMAScript 5 section 11.13, we see that there are simple assignments (=) and compound assignments (op=). The compound assignment operators are listed exhaustively in the spec:

*=  /=  %=  +=  -=  <<=  >>=  >>>=  &=  ^=  |=

None of these operators apply a named function.

answered Jul 20, 2014 at 18:22

apsillers

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Comments

plalx · Accepted Answer · 2014-07-20 18:50:17Z

0

Well, there's no specific operator, however nothing prevents you from doing something similar using an object as a variable context.

function VarContext() {}

VarContext.prototype.someFunction = function (member) {
    //could be any kind of processing
    this[member] += 1;
};

var ctx = new VarContext();

ctx.test = 1;
ctx.someFunction('test');
ctx.test; //2

Functions can be bound to the object as well.

someFunction = ctx.someFunction.bind(ctx);

Then you can just write:

someFunction('test');

answered Jul 20, 2014 at 18:50

plalx

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