javascript - boolean 过滤器

Question

我正在尝试编写一个函数，根据要查找的参数删除元素。我不确定为什么在给定 boolean 表达式时会失败:

function getRid(array, discardThis) {
  if (array.length === 0) {
    return []
  }
  let newArr = array.filter( function (element) {
    if (element != discardThis) {
      return element;
    }
  })
  return (newArr.length === array.length) ? [] : newArr;
}

getRid([true, true, true, false, true], true);

Answer 1

filter 函数应该返回一个 boolean 值，检查每个元素，如果应该保留，它将返回 true，如果不保留，则返回 false 't。尝试:

function getRid(array, discardThis) {
  if (array.length === 0) {
    return []
  }
  let newArr = array.filter( function (element) {
      return element != discardThis
    }
  )
  // I'm not clear on this check so I left it, 
  // but it would make more sense to simply return newArr
  return (newArr.length === array.length) ? [] : newArr
}