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jsonArray2.js
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63 lines (51 loc) · 1.52 KB
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const students = [
{
id: 1,
name: "John",
marks: 80,
},
{
id: 2,
name: "Jane",
marks: 13,
},
{
id: 3,
name: "Joe",
marks: 90,
},
];
console.log(students);
console.log(students[0]);
console.log(students[1]);
console.log(students[2]);
console.log(students[0].name);
console.log(students[1].name);
console.log(students[2].name);
console.log("-------------------------------------------------------------------------------------------");
// using map
let updatedStudents = students.map((s) => {
return {
id: s.id + 500,
name: s.name.toUpperCase(),
marks: s.marks + 2,
};
});
console.log("updatedStudents :", updatedStudents);
console.log("-------------------------------------------------------------------------------------------");
// using filter
let filteredStudents = students.filter((s) => {
s.passed = (s.marks >= 33);
return s;
});
console.log("filteredStudents :", filteredStudents);
let passStudents = filteredStudents.filter((s) => s.passed);
console.log("passStudents :", passStudents);
let failStudents = filteredStudents.filter((s) => !s.passed);
console.log("failStudents :", failStudents);
console.log("-------------------------------------------------------------------------------------------");
// using reduce
let sumOfMarks = students.reduce((acc, s) => {
return acc + s.marks;
}, 0);
console.log("sumOfMarks : ", sumOfMarks);