我有以下功能:为什么我不能调用函数,但我可以在控制台中打印它? JavaScript的
var groceries = ["toothpaste", ["plums", "peaches", "pineapples"], ["carrots", "corn", "green beans"], "orange juice", ["chocolate", "ice cream"], "paper towels", "fish"];
console.log("groceries", groceries);
function removeItems(arr, toRemove) {
function createKey(item) {
return Array.isArray(item) ? item.join('-') : item;
}
var removeDict = toRemove.reduce(function(d, item) {
var key = createKey(item);
d[key] = true;
return d;
}, {});
console.log("removeDict", removeDict);
return arr.filter(function(item) {
var key = createKey(item);
return !removeDict[key];
});
}
var result = removeItems(groceries, ["fish", "orange juice", ["chocolate", "ice cream"]]);
console.log("result", result);
(这来源于此之前的问题,我问): function to remove single items or arrays from within an array - javascript
如果我创建在调用该函数结束一个变量,它打印在控制台正确。
但是,如果我尝试直接调用该函数,就像这样:
removeItems(groceries, ["fish", "orange juice", ["chocolate", "ice cream"]]);
console.log("groceries", groceries);
的项目没有得到清除。为什么我不能直接调用该函数?我错过了什么吗?
因为该函数返回一个新的数组,你丢弃 –