jquery - I want to change a profile picture when i select a image - 


$('#profile_picture').on("change",function(){      var files = !!this.files ? this.files : [];

what above code !!this.files ? this.files : [] mean?

    if (!files.length || !window.filereader) return;       if (/^image/.test( files[0].type)){          var reader = new filereader();          reader.readasdataurl(files[0]);          reader.onloadend = function(){              $("#imgchange").attr("src", "+this.result+");         }     } });

that used check whether new fileapi supported. if new file api not supported file input's files property undefined !this.files false , when add 1 more ! false again negated true

$('#profile_picture').on("change", function () {     // files new property new file api, if if not supported assign empty array value of files     var files = !! this.files ? this.files : [];      //if there no files , filereader not supported return     if (!files.length || !window.filereader) return;      if (/^image/.test(files[0].type)) {         var reader = new filereader();         reader.readasdataurl(files[0]);         reader.onloadend = function (event) {             $("#imgchange").prop("src", event.target.result);         }     } });

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