Searching an array for a substring in Javascript

Question

I have searched across the web though have not had any luck in correcting my issue. What I want to do is search an array for a substring and return the result. An example of the array is like this:

the_array = ["PP: com.package.id, NN: Package Name","PP: com.another.id, NN: Another Name"];

What I want to do is search the_array for com.package.id making sure that it appears between the "PP:" and ",". Also please note that the array will contain several thousand values. Hope you can help, thank you.

What did you try? All you can do is iterating over the array and examine each string. — Felix Kling
– Felix Kling, Commented Jul 30, 2011 at 22:36
possible duplicate of In javascript, how do you search an array for a substring match — ripper234
– ripper234, Commented Sep 14, 2011 at 9:59

Mrchief · Accepted Answer · 2013-07-24 03:08:42Z

2

Easy way:

the_array.join("|").indexOf([str]) >= 0;

Other ways would be to loop thru the array using .each() or a simple for loop

Array.prototype.each = function(callback){
    for (var i =  0; i < this.length; i++){
        callback(this[i]);
    }
}

the_array.each(function(elem){
    console.log(elem.indexOf('<searchString goes here>'));
});

edited Jul 24, 2013 at 3:08

answered Jul 30, 2011 at 22:36

Mrchief

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5 Comments

Felix Kling Over a year ago

each is not a JavaScript function.

Felix Kling Over a year ago

FWIW, ECMAScript 5 introduced forEach: developer.mozilla.org/en/JavaScript/Reference/Global_Objects/… You can also find an alternative implementation there. But it seems to me that each is irrelevant for the problem.

Mrchief Over a year ago

Yes and Yes. Since ES5 is not universally supported yet, we need these workarounds.

Kamal Reddy Over a year ago

@Mrchief it is 'each.indexOf'. Please change it.

Mrchief Over a year ago

@KamalReddy: It's pseudocode, note that [str] is not an array but placeholder for search string in question. But I'll edit for clarity anyway.

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