Javascript - This code changing the image as expected but not the id?

Majd
August 25, 2024
227 views
1 vote
2 Answers

const currentTypesResult=[{id:'155', foodId:'511555522559744444', image: 'Some image string', example:'example'}]

const processedResults = currentTypesResult.map((item) => {
   
const { foodId, image, ...rest } = item;

return {
id: '5542',
image: 'data:image/png;base64,',
...rest
};
});

console.log(processedResults[0].id) // Prints 155? Why? Why not 5542?
console.log(processedResults[0].image) // Prints data:image/png;base64, (AS IT SHOULD)

I’m expecting id to change from 155 to 5542 when I print processedResults[0].id (It prints the old value 155) just like image was changed from some image string to data:image/png;base64, when I printed processedResults[0].image

Answers

As mentioned by @Antonia Šimić, give this a try;

const currentTypesResult=[{id:'155', foodId:'511555522559744444', image: 'Some image string', example:'example'}]

const processedResults = currentTypesResult.map((item) => {
   
const { id, foodId, image } = item;

return {
id: 5542,
image: 'data:image/png;base64,',
};
});

console.log(processedResults[0].id) 
console.log(processedResults[0].image)

You need to put the rest before the id property otherwise the id will get overwritten since it is already a part of the rest. Here is the working code example:

const currentTypesResult = [
  { id: '155', foodId: '511555522559744444', image: 'Some image string', example: 'example' }
];

const processedResults = currentTypesResult.map((item) => {
  const { foodId, image, ...rest } = item;

  return {
    ...rest, 
    id: "whatever you like",
    image: 'data:image/png;base64,'
  };
});

console.log(processedResults[0].id); // Now it should print 'whatever you like'
console.log(processedResults[0].image); // Should print "data:image/png;base64,"

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Javascript – This code changing the image as expected but not the id?

Answers