通过删除字符串计算数组的和？
通过删除字符串计算数组的和？
提问于 2021-03-08 11:29:36
我有一个数组，每个学生有3个索引：
var students = [
['Toto', 4, 17],
['Titi', 11, 12],
['Tata', 12, 14]
];我必须计算每个学生的总数。除此之外，我必须避开绳子。
我为学生Toto获得的结果是0而不是21。
我不明白问题出在哪里？
var students = [
['Toto', 4, 17],
['Titi', 11, 12],
['Tata', 12, 14]
];
var result = 0;
for (var i = 0; i < students.length; i++) {
if (typeof(students[i]) === "number") {
result += students[i];
}
console.log("Student " + students[i][0] + " has the result " + result);
}
回答 6
Stack Overflow用户
回答已采纳
发布于 2021-03-08 11:39:31
你可以运行这个
var students = [
['Toto', 4, 17],
['Titi', 11, 12],
['Tata', 12, 14]
];
for (var i = 0; i < students.length; i++) {
var result = 0;
for (var j = 0; j <= students[i].length; j++) {
if (typeof(students[i][j]) === "number") {
result += students[i][j];
}
}
console.log("Student " + students[i][0] + " has the result " + result);
}
Stack Overflow用户
发布于 2021-03-08 11:37:50
您只需在这里使用与Array.prototype.reduce一起的析构：
const students = [['Toto', 4, 17], ['Titi', 11, 12], ['Tata', 12, 14]];
for (const student of students) {
const [ name, ...summands ] = student;
console.log(`${name} scored ${summands.reduce((acc,val)=>acc+val,0)}`)
}
对于更简洁的版本，您可以在For -definition中直接重构：
const students = [['Toto', 4, 17], ['Titi', 11, 12], ['Tata', 12, 14]];
for (const [ name, ...summands ] of students) {
console.log(`${name} scored ${summands.reduce((acc,val)=>acc+val,0)}`)
}
这也适用于长度不同的总结表：
const students = [['Toto'], ['Titi', 1,2,3,4,5,6], ['Tata', 12, 14]];
for (const [ name, ...summands ] of students) {
console.log(`${name} scored ${summands.reduce((acc,val)=>acc+val,0)}`)
}
Stack Overflow用户
发布于 2021-03-08 11:36:51
在students数组中，每个项都是一个数组。
const students = [
['Toto', 4, 17],
['Titi', 11, 12],
['Tata', 12, 14]
];
for (let i = 0; i < students.length; i++) {
const student = students[i];
let result = 0;
for (let j = 0; j < student.length; j++) {
if (typeof(student[j]) === "number") {
result += student[j];
}
}
console.log("Student " + students[i][0] + " has the result " + result);
}
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/66529002
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