Removing empty or undefined elements from an array

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Remove empty elements from an array in Javascript 36 answers

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这是我过去写的一个有用的代码片段。

Array.prototype.empty = function() {
    for (var i = 0, s = this.length; i < s; i++) { this.pop(); }
    return this;
};

Array.prototype.removeAll = function(item) {
    var result = [];

    for (var i = 0, j = 0, s = this.length; i < s; i++) {
        if (this[i] != item) { result[j++] = this[i]; }
    }

    this.empty();
    for (var i = 0, s = result.length; i < s;) { this.push(result[i++]); }
};

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您可以将数组传递给临时数组，而不添加空或未定义的数组

function clean(item) {
    var tempArr = [];
    for (var i = 0; i < item.length; i++) {
        if (item[i] !== undefined && item[i] != "") {
            tempArr.push(item[i]);
        }
    }
    return tempArr;
}

---

arr = arr.filter((entry) => { return entry.trim() != '' })

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