var Replace = function (array, oldChild, newChild){ 
var index1 = array.indexOf(oldChild); 
var index2 = array.indexOf(newChild); 
if (index1 !== -1 && index2 === -1) { 
array[index1] = newChild; 
return true ; 
} 
 else { 
return false ; 
} 
} 
; 
module.exports = Replace;