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John Peter
Pune, Maharashtra, India
How to use foreach loop in javascript with Example
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Define for..in loop? 
for..in loop is used to iterate object in javascript.

for (var index in object){
      enumeration method loop
}
Example
var osList = new Array();
    osList.push("Android");
    osList.push("Windows");
    osList.push("Linux");
    osList.push("Mac");

for (var index in osList){
    document.write("osList["+index+"] : "+osList[index]+"<br />");
}
Demo & Output 
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