jquery - How to get JSON object values for a Particular key -

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i using jqgrid grid data in json object format.

result : 

{"key":"value1"},{"key":"value2", "id":"id"}

i need values array "key".

var arr = [{"key":"value1"},{"key":"value2", "id":"id"}];  var anarrayofkeyvalues = [];    arr.foreach(function(ob, i) {    if("key" in ob) anarrayofkeyvalues.push(ob.key);  });    console.log(anarrayofkeyvalues); // ["value1", "value2"]


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