Question 33587 in React native Question posted in
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How to update old value with new value in array [React native]

I have array

[{
        "studentname": "abc",
        "marks": "20"
    },
    {
        "studentname": "abc2",
        "marks": "20"
    }
]

I have want add 10 more marks where studentname=abc into marks so how do this

eg.10+20=30
so the output will be

[{
        "studentname": "abc",
        "marks": "30"
    },
    {
        "studentname": "abc2",
        "marks": "20"
    }
]
Tags:

4

Answers


  1. 0 
        const updatedArray = array.map(item => {
  if (item.studentname === "abc") {
    return {
      studentname: "abc",
      marks: parseInt(item.marks, 10) + 10
    };
  } else {
    return item;
  }
});
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  2. 0

    This is one clean way to do it.

    const x= [{
        "studentname": "abc",
        "marks": "20"
    },
    {
        "studentname": "abc2",
        "marks": "20"
    }
]

x.forEach(function(obj) {
    if (obj.studentname === 'abc') {
        obj.marks = Number(obj.marks) + 10
    }
});

console.log(x)
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  3. 0 
    const array= [{
        "studentname": "abc",
        "marks": "20"
    },
    {
        "studentname": "abc2",
        "marks": "20"
    }
]

array.map((item,index)=> {
    if (item.studentname == 'abc') {
        item.marks = Number(item.marks) + 10
    }
});

console.log("Your Updated Array Here:->",array)
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  4. 0
    • Loop through the array of objects
    • Check if the studentname property of the current object is equal to abc
    • If it is, add 10 to the marks property of the current object
    • After the loop, the array will be updated with the modified object
    const arr = [{"studentname": "abc", "marks": "20"},    
       {"studentname": "abc2","marks": "20" }];

for (let i = 0; i < arr.length; i++) {
  if (arr[i].studentname === "abc") {
        arr[i].marks = parseInt(arr[i].marks) + 10;
    }
}

console.log(arr);
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