CODEWITHSUNDEEP
javascript
Syed Rasheed
Syed Rasheed

Reputation: 559

how to get functionName from a javascriptCode which is in string format

this is my code

var javascriptCode="function adding(a,b){ return a+b}"

and i want to pick functionName adding from that string how to do that?

i have tried by finding its index as

var indexStart=javascriptCode.indexOf("function ");
var indexEnd=javascriptCode.indexOf("(");
var res = javascriptCode.substring(indexStart, indexEnd);

but i am getting the output as function adding, is their any other way to do this

Upvotes: 0

Views: 33

Answers (2)

Xiangyu.Wu
Xiangyu.Wu

Reputation: 459

You could use regular expression.

var javascriptCode="function adding(a,b){ return a+b}"
var regex = /function\s*([^\(]*)\(/
var matchResult = javascriptCode.match(regex)
var funcName = null;
if (matchResult && matchResult.length) {
    funcName = matchResult[1];
}
console.log(funcName);

Upvotes: 1

Anik Islam Abhi
Anik Islam Abhi

Reputation: 25352

Try like this

var javascriptCode="function adding(a,b){ return a+b}";
var indexStart=javascriptCode.indexOf(" ");
var indexEnd=javascriptCode.indexOf("(");
var res = javascriptCode.substring(indexStart+1, indexEnd);
console.log(res);

JSFIDDLE

Upvotes: 1

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