empty array



this code will set the variable a to a new empty array. this is perfect if you don't have references to the original array a anywhere else because this actually creates a brand new (empty) array. you should be careful with this method because if you have referenced this array from another variable or property, the original 

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years ago. please note that results of empty() when called on nonexisting nonpublic variables of a class are a bit confusing if using magic method __get (as previously mentioned by nahpeps at gmx dot de). consider this example: <?php class registry { protected $_items = array(); public function __set($key, $value) déc. myarray = []; bad. that isn't the optimal way to get a fresh array; to truncate an array, and thus empty it, you should set the length property to zero: myarray.length = ; good! setting the length equal to zero empties the existing array, not creating another array! this helps you to avoid pointer issues with 

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you define an array and want to empty its contents. usually, you would do it like this: shape : int or tuple of int. shape of the empty array. dtype : datatype, optional. desired output datatype. order : {'c', 'f'}, optional. whether to store multidimensional data in rowmajor (cstyle) or columnmajor (fortranstyle) order in memory. returns: out : ndarray. array of uninitialized (arbitrary) data of the given shape, 

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this matlab function returns an empty by array of the class of classname. arrays are awesome! they allow you to store multiple values in a convenient, indexed set. in javascript, arrays can be declared literally or they can be initialized using the array constructor function. but wait… what if you want to empty an array instead of creating one? hmm… perhaps not as 

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déc. clearing an array. let's say we want to clear the array in the following variable myarray: var myarray = [ elem, elem, ]; first, you can replace the current value with an empty array. second, you can set the array's length to zero. this is one of the fastest and easiest ways of emptying an array. of course there are may other ways, but those usually include creation of a new array. this way you reuse the same array. var myarray = ; console.log( myarray ) => myarray.length = ; console.log( myarray ) =>

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mai if the intent of your condition is to check that the array contains elements, using count($array) === is the best and most readable solution.

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