javascript - AngularJS: delete charAt last index of "," -

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how write code in angularjs delete character @ last index of ",".

here equivalent java code:

stringbuilder.deletecharat(stringbuilder.lastindexof(","));

please help.

you 

str = str.replace(/,([^,]*)$/, "$1");

or

var pos = str.lastindexof(","); str = str.substr(0, pos) + str.substr(pos + 1);

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