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The Details Part 2 Let's expand our simplified version of the function to look like this: function searchandreplace (the_string, search_string, replace_string, occurrences, backward) {
if (search_string == replace_string) {
return the_string;
}
var found = 0;
if (backward == true) {
work magic backward!
}
else {
work magic forward!
}
return the_string;
}
The first if statement looks to see that search_string and replace_string are different. If they are the same, the string that is sent to the function is returned without any changes being made. The remainder of the function is not executed, thus avoiding an endless looping problem (which would show up later in the function if executed). The var found = 0 part simply sets the variable found to 0. This variable will be used later in the function. The second part, the if - else statement, simply checks to see whether we should be starting from the back and working backwards or starting from the front and working forwards. If the argument backward is set to true, the argument occurrences must also be set to an integer greater than 0. For the remainder of the Details section, we will only be considering the work magic forward! part of the function. I think it is easier to visualize working forward than it is to visualize working backward. The code is very much the same for both parts and you should have no trouble going back and understanding the work magic backward! part.
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Search and Replace String 1.0
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