Last active
May 9, 2016 08:57
-
-
Save Josema/863fa0bac3682b197a1a1e02b18d794c to your computer and use it in GitHub Desktop.
Convert arrow function into classic function in runtime
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
function isArrowFunction(f) { | |
return typeof f == 'function' && /^\([^)]*\)\s*=>/.test(f.toString()); | |
} | |
function arrowFunctionToClassic(f) { | |
var string_function_converted = f.toString().replace(/\(([^)]*)\)\s*=>([\s\S]+)/, function(all, params, content) { | |
if ( content.substr(-1) != '}' ) | |
content = '{return '+ content + ';}'; | |
return 'function('+params+')'+content; | |
}); | |
return eval('(' + string_function_converted + ')'); | |
} | |
function convertObjectArrowFunctionToClassic( object ) { | |
for (var prop in object) | |
if ( isArrowFunction(object[prop]) ) | |
object[prop] = arrowFunctionToClassic(object[prop]); | |
} | |
//////// TESTING | |
var obj = { | |
n: 25, | |
f1: function (a) { return this.n*a; }, | |
f2: function f2(a) { return this.n*a; }, | |
f3: (a) => this.n*a, | |
f4: (a)=> { | |
a*=2; | |
return this.n*a; | |
} | |
}; | |
console.log('======= Before') | |
console.log(isArrowFunction(obj.f1), obj.f1(2)); // false 50 | |
console.log(isArrowFunction(obj.f2), obj.f2.call({n:50}, 2)); // false 100 | |
console.log(isArrowFunction(obj.f3), obj.f3(2)); // true NaN | |
console.log(isArrowFunction(obj.f4), obj.f4.call({n:50}, 2)); // True NaN | |
convertObjectArrowFunctionToClassic( obj ); | |
console.log('======= After') | |
console.log(isArrowFunction(obj.f1), obj.f1(2)); // false 50 | |
console.log(isArrowFunction(obj.f2), obj.f2.call({n:50}, 2)); // false 100 | |
console.log(isArrowFunction(obj.f3), obj.f3(2)); // false 50 | |
console.log(isArrowFunction(obj.f4), obj.f4.call({n:50}, 2)); // false 200 |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment