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Use: var data = new Array(); Or, more succinctly: var data = []; After your edit you mention that the first script block is loaded asynchronously. Your code will not work as written. data is a global variable, once it is loaded onto the page. You need to use a callback pattern to properly execute the code.
This pen interactively teaches how to use JavaScript arrays....
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13 cze 2019 · filter() creates a new array if the items of an array pass a certain condition. map() creates a new array by manipulating the values in an array. reduce() calculates a single value based on an array.
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