I wanted to contribute a fix for this to the lodash repo but thought I should check that I'm not doing something wrong first...
When I use standard lodash in this example...
const _ = require('lodash');
run = () => {
const mapping = {
a: 'hello',
b: 'world'
};
const object = {
a: { value: true },
b: { value: false }
};
// this is the original transform function that takes three arguments...
// 1. the object to be transformed
// 2. the transform function
// 3. the accumulator object
const transformed = _.transform(
object,
(a, v, k, o) => { a[mapping[k]] = _.get(v, 'value'); },
{}
);
console.log(transformed);
};
run();
The output is { hello: true, world: false } like I expected.
When logging a, v, k, and o on the above code the output is...
1 a: {}
1 v: { value: true }
1 k: a
1 o: { a: { value: true }, b: { value: false } }
2 a: { hello: true }
2 v: { value: false }
2 k: b
2 o: { a: { value: true }, b: { value: false } }
However, when I run (what I think is) the equivalent code using lodash/fp...
const _ = require('lodash/fp');
run = () => {
const mapping = {
a: 'hello',
b: 'world'
};
const object = {
a: { value: true },
b: { value: false }
};
// this is the fp transform function that takes two arguments...
// 1. the transform function
// 2. the accumulator object
// it then returns a function that takes one argument...
// 1. the object to be transformed
const transformed = _.transform(
(a, v, k, o) => { a[mapping[k]] = _.get('value')(v); },
{}
)(object);
console.log(transformed);
};
run();
The output is { undefined: false }. This is because the parameters to the iterator do not seem to be correct. When I log a, v, k, and o I get the following output...
1 a: {}
1 v: { value: true }
1 k: undefined
1 o: undefined
2 a: { undefined: true }
2 v: { value: false }
2 k: undefined
2 o: undefined
Am I doing something wrong or is this not working as expected?
I have also added this as an issue on the repo but thought I'd add here as maybe I would get a faster response :D
Try this:
const transform = _.transform.convert({ cap: false });
const transformed = transform(
(a, v, k, o) => { a[mapping[k]] = _.get('value')(v); },
{}
)(object);