To update and push a new value into an array while keeping the other values static, you can use the concat method to create a new array with the updated value and the original values. Here's an example in JavaScript:
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let originalArray = [1, 2, 3];
let newValue = 4;
let updatedArray = originalArray.concat(newValue);
console.log(originalArray); // [1, 2, 3]
console.log(updatedArray); // [1, 2, 3, 4]
You can also use the spread operator ... to achieve the same result:
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let originalArray = [1, 2, 3];
let newValue = 4;
let updatedArray = [...originalArray, newValue];
console.log(originalArray); // [1, 2, 3]
console.log(updatedArray); // [1, 2, 3, 4]
This way, the original array remains unchanged, and a new array is created with the updated value. If you want to update an existing value in the array, you can use indexing to access the specific element and assign a new value to it. For example:
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let originalArray = [1, 2, 3];
let indexToUpdate = 1;
let newValue = 4;
let updatedArray = [...originalArray];
updatedArray[indexToUpdate] = newValue;
console.log(originalArray); // [1, 2, 3]
console.log(updatedArray); // [1, 4, 3]
In this example, the indexToUpdate variable is used to specify the index of the value to be updated in the array. The updatedArray is created as a shallow copy of the originalArray using the spread operator, and the value at the specified index is then updated.
Note that it's important to always use a new array or create a shallow copy of the original array when making updates, as modifying the original array directly can have unintended consequences and may cause bugs in your code.
In some cases, you may also want to make a deep copy of the original array instead of a shallow copy, if the elements in the array are objects that can be modified. A deep copy ensures that the original objects are not modified when changes are made to the copy. To make a deep copy, you can use a function such as JSON.parse(JSON.stringify(originalArray)).
In summary, to update and push a new value into an array while keeping the other values static, you can use the concat method or the spread operator ... to create a new array with the updated value and the original values, or use indexing to access the specific element and assign a new value to it. It's important to always make updates to a new array or shallow/deep copy of the original array to avoid unintended consequences.