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over.spec.js
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over.spec.js
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import { assoc } from './assoc.js'
import { lens } from './lens.js'
import { lensIndex } from './lensIndex.js'
import { lensPath } from './lensPath.js'
import { over } from './over.js'
import { prop } from './prop.js'
import { toUpper } from './toUpper.js'
const testObject = {
foo : 'bar',
baz : {
a : 'x',
b : 'y',
},
}
test('assoc lens', () => {
const assocLens = lens(prop('foo'), assoc('foo'))
const result = over(
assocLens, toUpper, testObject
)
const expected = {
...testObject,
foo : 'BAR',
}
expect(result).toEqual(expected)
})
test('path lens', () => {
const pathLens = lensPath('baz.a')
const result = over(
pathLens, toUpper, testObject
)
const expected = {
...testObject,
baz : {
a : 'X',
b : 'y',
},
}
expect(result).toEqual(expected)
})
test('index lens', () => {
const indexLens = lensIndex(0)
const result = over(indexLens, toUpper)([ 'foo', 'bar' ])
expect(result).toEqual([ 'FOO', 'bar' ])
})