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var X = [10,20,10,20,10,20]; var index; index = X.indexOf(10); document.write(index); index = X.lastIndexOf(10); document.write(index); index = X.indexOf(10 , 2); document.write(index);
var X = [10,20,10,20,10,20];
var index;
index = X.indexOf(10);
document.write(index);
index = X.lastIndexOf(10);
document.write(index);
index = X.indexOf(10 , 2);
document.write(index);
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