Pass variable to function scope

Question

Is it possible to do the following in some other way, without passing parameters?

var f = function(){
    console.log(v);
}

var original = f;

f = function(){
    var v = "test";
    original();
};

// the following line is called by 3rd party code
f();  // it errors out here - v is not defined

without passing parameters, Global. Make v a global variable. — Tushar
– Tushar, Commented Nov 7, 2016 at 5:08

prasanth · Accepted Answer · 2016-11-07 05:26:42Z

1

Make var v as a globel variable

var v ;
var f = function(){
  v="new test"
    console.log(v);
}

var original = f;

f = function(){
     v = "test";
    original();
};

f();//f function
original();//original function also working

edited Nov 7, 2016 at 5:26

answered Nov 7, 2016 at 5:09

prasanth

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3 Comments

Maxim Balaganskiy Over a year ago

can JS engine, in theory, interrupt execution between v = "test"; and original(); and replace v with another value?

prasanth Over a year ago

@MaximBalaganskiy Ya..var v is the globel variable .so easily replace value of that

prasanth Over a year ago

@MaximBalaganskiy see the updated answer .The v replace with another value on original function call

Gaurav joshi · Accepted Answer · 2016-11-07 05:12:30Z

0

Use can use JavaScript Closures here

function f() {
    var v = 'test';
    return (function () {
        console.log(v)
    })();
}

answered Nov 7, 2016 at 5:12

Gaurav joshi

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Comments

Tolgahan Albayrak · Accepted Answer · 2016-11-07 05:13:07Z

0

Another approach here:

var f = function(){
    console.log(arguments[0]);
};

f = f.bind(null, 'test');

f();

answered Nov 7, 2016 at 5:13

Tolgahan Albayrak

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