用于删除奇数数组元素的JavaScript数组操作

Question

我需要帮助; 我有这样一个数组:

myarray = ["nonsense","goodpart","nonsense2","goodpar2t","nonsense3","goodpart3",]

我需要从数组中删除所有"废话"部分.

废话总是有一个偶数索引.

Answer 1

我建议,基于"无意义"的词总是(如问题中所述)"偶数"元素:

var myarray = ["nonsense", "goodpart", "nonsense2", "goodpar2t", "nonsense3", "goodpart3"],
  filtered = myarray.filter(function(el, index) {
    // normally even numbers have the feature that number % 2 === 0;
    // JavaScript is, however, zero-based, so want those elements with a modulo of 1:
    return index % 2 === 1;
  });

console.log(filtered); // ["goodpart", "goodpar2t", "goodpart3"]

但是,如果您希望按数组元素本身进行过滤,则删除包含"无意义"一词的所有单词:

var myarray = ["nonsense", "goodpart", "nonsense2", "goodpar2t", "nonsense3", "goodpart3"],
  filtered = myarray.filter(function(el) {
    // an indexOf() equal to -1 means the passed-in string was not found:
    return el.indexOf('nonsense') === -1;
  });

console.log(filtered); // ["goodpart", "goodpar2t", "goodpart3"]

或者只查找并保留以下开头的单词'good':

var myarray = ["nonsense", "goodpart", "nonsense2", "goodpar2t", "nonsense3", "goodpart3"],
  filtered = myarray.filter(function(el) {
    // here we test the word ('el') against the regular expression,
    // ^good meaning a string of 'good' that appears at the beginning of the
    // string:
    return (/^good/).test(el);
  });

console.log(filtered); // ["goodpart", "goodpar2t", "goodpart3"]

参考文献:

• Array.prototype.filter().
• Array.prototype.indexOf().
• JavaScript正则表达式.
• RegExp.prototype.test().
• String.prototype.indexOf().