课程代码

nodejs/nodeExperiment2/array_practice.js

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+const numbers = [15, 8, 23, 4, 42, 16, 7];
+const students = [
+    { name: '张三', score: 85 },
+    { name: '李四', score: 62 },
+    { name: '王五', score: 91 }
+];
+
+console.log('1. slice() - 数组切片');
+const sliced = numbers.slice(1, 4);
+console.log('numbers.slice(1, 4):', sliced);
+
+console.log('\n2. filter() - 筛选元素');
+const evenNumbers = numbers.filter(numbers => numbers % 3 == 0);
+console.log('偶数:', evenNumbers);
+
+console.log('\n3. find() - 查找元素');
+const findScore = students.find(student => student.score > 90);
+console.log('分数>90的学生:', findScore);
+
+console.log('\n4. findIndex() - 查找索引');
+const index = numbers.findIndex(numbers => numbers > 20);
+console.log('第一个>20的数的索引:', index);
+
+console.log('\n5. every() - 所有元素满足条件');
+
+const allPassed = students.every(student => student.score >= 60);
+console.log('所有学生都及格:', allPassed);
+
+
+console.log('\n6. some() - 至少一个满足条件');
+const hasHighScore = students.some(student => student.score > 90);
+console.log('有高分学生:', hasHighScore);
+
+console.log('\n7. unshift() - 开头添加');
+const arr = [2, 3];
+arr.unshift(1);
+console.log('添加后:', arr);
+
+console.log('\n8. splice() - 添加删除');
+const colors = ['red', 'green', 'blue'];
+colors.splice(1, 1, 'yellow');
+console.log('替换后:', colors);
+
+console.log('\n9. sort() - 排序');
+const sortedAsc = [...numbers].sort((a, b) => a - b);
+const sortedDesc = [...numbers].sort((a, b) => b - a);
+console.log('升序:', sortedAsc, '降序:', sortedDesc);
+
+console.log('\n10. reduce() - 累加');
+const sum = numbers.reduce((total, num) => total + num, 0);
+console.log('数组求和:', sum);