javascript - 几个数组为空

Question

我有 3 个数组:

tabNoms = new Array("Jean", "Maximilien", "Brigitte", "Sonia", "Jean-Pierre", "Sandra");
tabMaximum = new Array();
tabMinimum = new Array();

目标是从数组 tabNoms 中恢复每个元素，它必须有最多 4 个字母和 put in tabMaximum。

这是我的算法，但它不起作用

tabNoms = new Array("Jean", "Maximilien", "Brigitte", "Sonia", "Jean-Pierre", "Sandra");
tabMaximum = new Array();
tabMinimum = new Array();
 function main()
 {
  for(var i = 0; i<tabNoms.length; i++){
   if(tabNoms[i] < 4){
    tabMaximum.push(tabNoms[i]);
   }
  }
 document.write("Maximum 4 letters : " + tabMaximum);
}

你有想法吗？请 ？谢谢

Answer 1

你必须纠正你的if condition。改变

if(tabNoms[i] < 4){

为此

if(tabNoms[i].length <= 4){

因为这里你要检查string的length

tabNoms = new Array("Jean", "Maximilien", "Brigitte", "Sonia", "Jean-Pierre", "Sandra");
tabMaximum = new Array();
tabMinimum = new Array();



function main()
 {
   for(var i = 0; i<tabNoms.length; i++){
    if(tabNoms[i].length <= 4){
          tabMaximum.push(tabNoms[i]);
     }
   }
 console.log("Maximum 4 letters : " + tabMaximum);
}
main();

var result=tabNoms.filter(obj => obj.length <= 4);
console.log(result);

1. 您也可以使用 Array.propotype.filter()

   var result=tabNoms.filter(obj => obj.length <= 4);
   console.log(result);
   

tabNoms = new Array("Jean", "Maximilien", "Brigitte", "Sonia", "Jean-Pierre", "Sandra");
var result = tabNoms.filter(obj => obj.length <= 4);
console.log(result);