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109

Find element in array using regex match without iterating over array

rated 0 times [ 113] [ 4] / answers: 1 / hits: 45532 / 13 Years ago, fri, august 12, 2011, 12:00:00

I have an array of elements

[page=4, sortOrder=asc, datePosted=all-time]

Using javascript or jquery I want to find the index of the element which begins sortOrder= . I will not know the full string of this element at compile time, just the sortOrder= part.

I'm assuming that this can be done without the need to iterate over the array and perform item.match(sortOrder=), but maybe I am wrong.

Thanks for any help.

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answered 13 Years ago mahogany · Accepted Answer

If you want to get the value inside an array that matches a specific regex:

...to get the value of the first match only, you can use find()

const array = [page=4, sortOrder=asc, datePosted=all-time, sortOrder=desc];

const match = array.find(value => /^sortOrder=/.test(value));

// match = sortOrder=asc

...to get an array of all match results, you can use filter()

const array = [page=4, sortOrder=asc, datePosted=all-time, sortOrder=desc];

const matches = array.filter(value => /^sortOrder=/.test(value));

// matches = ['sortOrder=asc', 'sortOrder=desc'];

...to get the index of the first match, you can use findIndex()

const array = [page=4, sortOrder=asc, datePosted=all-time, sortOrder=desc];

const index = array.findIndex(value => /^sortOrder=/.test(value));

// index = 1;

If you are not using ES6, here's the code in ES5.