Determine if a specific string is present in any of the values within an array by utilizing

Question

Determine if a specific string is present in any of the values within an array by utilizing

A scenario: I have a cookie that has been split into an array:

var treats = document.cookie.split(';');
[dogs=bla, cats=sdfgh, cabbages=kjhgfdfg]

If I aim to locate the index of 'cats=sdfgh', I can utilize

treats.indexOf('cats=sdfgh');
1

However, if my goal is to determine whether the value of cats has been set, how do I go about it? Would treats.indexOf(find('cat=')); or a similar approach work?

Hence, minus knowledge of the cats' value, how do I ascertain its existence in the cookie?

Additionally, what's the technique to acquire the index number of that specific cookie?

javascript arrays cookies

Answer 1

Answer №1

If you want to extract a value from a cookie, you can use a simple regular expression like this:

if(value = document.cookie.match(/(^cats=|;cats=)([^;]+)/)){
    console.log(value);
}

This will return an array where the third element is your desired value if it's found :)

JSFIDDLE

Alternatively, if you don't need to support outdated browsers, consider checking out the MDN cookie framework mentioned in the comments.

Answer 2

If you want to extract a value from a cookie, you can use a simple regular expression like this:

if(value = document.cookie.match(/(^cats=|;cats=)([^;]+)/)){
    console.log(value);
}

This will return an array where the third element is your desired value if it's found :)

JSFIDDLE

Alternatively, if you don't need to support outdated browsers, consider checking out the MDN cookie framework mentioned in the comments.

Answer 3

Answer №2

If you want to locate the initial corresponding value in an array, you can utilize the Array.prototype.some method:

var cookies = document.cookie.split(';'); // ["dogs=bla", "cats=sdfgh", "cabbages=kjhgfdfg"]

var matchFound = cookies.some(function(cookie) {
    return cookie.indexOf('cats') == 0;
}); // => true

Answer 4

If you want to locate the initial corresponding value in an array, you can utilize the Array.prototype.some method:

var cookies = document.cookie.split(';'); // ["dogs=bla", "cats=sdfgh", "cabbages=kjhgfdfg"]

var matchFound = cookies.some(function(cookie) {
    return cookie.indexOf('cats') == 0;
}); // => true

Determine if a specific string is present in any of the values within an array by utilizing

Answer №1

Answer №2

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