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I'm interested if there is any function like array_map or array_walk from php.
Don't need an for that travels all the array. I can do that for myself.
var array = ['dom', 'lun', 'mar', 'mer', 'gio', 'ven', 'sab'];
// i would like something like this if exists - function(array, 'upperCase');
929
To convert all array elements to uppercase:Use the map() method to iterate over the array. On each iteration, call the toUpperCase() method to convert the string to uppercase and return the result. The map method will return a new array with all strings converted to uppercase.
The syntax for the map() method is as follows: arr. map(function(element, index, array){ }, this); The callback function() is called on each array element, and the map() method always passes the current element , the index of the current element, and the whole array object to it.
Convert all the elements in each and every word in to lowercase using string. toLowerCase() method. Loop through first elements of all the words using for loop and convert them in to uppercase.
To convert all array elements to lowercase:Use the map() method to iterate over the array. On each iteration, call the toLowerCase() method to convert the string to lowercase and return the result. The map method will return a new array containing only lowercase strings.
You can use $.map() in order to apply String.toUpperCase() (or String.toLocaleUpperCase(), if appropriate) to your array items:
var upperCasedArray = $.map(array, String.toUpperCase);
Note that $.map() builds a new array. If you want to modify your existing array in-place, you can use $.each() with an anonymous function:
$.each(array, function(index, item) {
array[index] = item.toUpperCase();
});
Update: As afanasy rightfully points out in the comments below, mapping String.toUpperCase directly will only work in Gecko-based browsers.
To support the other browsers, you can provide your own function:
var upperCasedArray = $.map(array, function(item, index) {
return item.toUpperCase();
});
Check out JavaScript Array.map for info on the official JavaScript map function. You can play around with the sample there to see how the function works. Try copying this into the example box:
var array = ['dom', 'lun', 'mar', 'mer', 'gio', 'ven', 'sab'];
var uppers = array.map(function(x) { return x.toUpperCase(); });
console.log(uppers);
And it will print:
DOM,LUN,MAR,MER,GIO,VEN,SAB
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