JavaScript data removes null values

JS array to filter out false, NULL, 0, "", Undefined, and Nan values method

For False,null,0,undefiend,nan Direct fetch ! is all true , so here only need to judge the empty string "" ;
Look directly at the code:

function bouncer(arr) {  // Don‘t show a false ID to this bouncer. return arr.filter(function(val){ return !(!val || val === ""); });}bouncer([7, "ate", "", false, 9]);

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Operation Result:

Bouncer ([7, "ate", "" ", false, 9]);

When the Enter parameter is [false, null, 0, NaN, undefined, ""]
The running result is

[]

Note here that NaN comparisons with any value including its own result are false, so you can use the isNaN () function to check;

Array.prototype.notempty = function(){

     return this .filter(t => t!=undefined && t!== null ); }

JavaScript data removes null values