Removing an empty string from an array logic

 

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  • Remove empty elements from an array in Javascript 36 answers

    • One problem is that Arrays and Objects are slightly different things. To iterate over an array you can use things like: 

    for (var i=0; i<arr.length; i++) {
  /* code */
}

arr.forEach(function(item, index, arr) {
  /* code */
});

    The for..in structure is used to iterate over the keys in an Object: 

    var obj = { b : 1, c:2 }

for (var key in obj) {
  console.log(key) // will output first b then c
}

    The simplest way to remove empty values in an array is this: 

    var arr = [ 1, '', null, 3, 0, undefined, '', 4 ];
var filtered = arr.filter(function(item){ return item != null && item !== ''; });

console.log(filtered) // [1,3,0,4]

    Obviously you can add more things that should be filtered out of your original array by changing the function passed to filter .

    或者使用filter方法的简单方法。 

    var newArray = oldArray.filter(function(v){return v!==''});
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