Search multi-dimensional array JavaScript

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If you want it to be fast, you’ll want a for loop so that you can break the loop when the match is found.

var result;
for( var i = 0, len = selected_products.length; i < len; i++ ) {
    if( selected_products[i][0] === 'r1' ) {
        result = selected_products[i];
        break;
    }
}

Of course this assumes there’s only one match.

If there’s more than one, then you could use $.grep if you want jQuery:

var result = $.grep(selected_products, function(v,i) {
    return v[0] === 'r1';
});

This will give you a new Array that is a subset of the matched items.

In a similar manner, you could use Array.prototype.filter, if you only support modern JavaScript environments.

var result = selected_products.filter(function(v,i) {
    return v[0] === 'r1';
});

One other solution would be to create an object where the keys are the rn items. This should give you a very fast lookup table.

var r_table = {};
for( var i = 0, len = selected_products.length; i < len; i++ ) {
    r_table[selected_products[i][0]] = selected_products[i];
}

Then do your lookups like this:

r_table.r4;

Again this assumes that there are no duplicate rn items.

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