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npm i switch-js
const switcher = require('switch-js');
const valueToTest = 'foo';
switcher(valueToTest)
.case('foo', () => console.log('foo!'))
.case('bar', () => console.log('bar!'))
.default(() => console.log('no match found in given cases!'))
.always(() => console.log('this is cool!'));
// result:
// foo!
// this is cool!
Check for multiple cases:
switcher(valueToTest)
.cases(['foo', 'bar'], () => console.log('foo or bar!'))
.default(() => console.log('no match found in given cases!'));
// result: foo or bar!
Check if value is matched by a function:
switcher(valueToTest)
.caseWhen(value => typeof value === 'string', () => console.log('a string!'))
.caseWhen(value => typeof value === 'number', () => console.log('a number!'))
.default(() => console.log('other datatypes!'));
// result: a string!
Use to
to set value:
const valueInUppercase = switcher(valueToTest)
.case('foo').to('FOO!')
.case('bar').to('BAR!')
.value('NO MATCH FOUND!');
// result: FOO!
// .value('NO MATCH FOUND!')
// has the same effect as
// .default().to('NO MATCH FOUND!').value()
Use mapTo
to set the value by a function:
const valueInUppercase = switcher(valueToTest)
.cases(['foo', 'bar']).mapTo(value => value.toUpperCase())
.default().mapTo(value => value.toUpperCase() + ' IS NOT A MATCH!')
.value();
// result: 'FOO'
switch(value)
start a switch chain
value
Value to checkcase(caseValue[, matchedCallback][, notMatchedCallback])
The case method you know
caseValue
matchedCallback
Function, optional. Invoked if caseValue
equals deeply to value
notMatchedCallback
Function, optional. Invoked otherwisecases(caseValues[, matchedCallback][, notMatchedCallback])
Check for multiple case values
caseValues
Array of caseValue
matchedCallback
Function, optional. Invoked if caseValues
includes value
notMatchedCallback
Function, optional. Invoked otherwisecaseWhen(matcher[, matchedCallback][, notMatchedCallback])
Check by a function
matcher
A match function used to check if value
is a matchmatchedCallback
Function, optional. Invoked if matcher(value)
returns a truthy valuenotMatchedCallback
Function, optional. Invoked otherwisedefault([noMatchFoundCallback, matchFoundCallback])
The default method you know
noMatchFoundCallback
Function, optional. Invoked if no match is foundmatchFoundCallback
Function, optional. Invoked otherwisealways(callback)
Invoked anyway
callback
Functionto(valueToReturn)
Set a new value to return by value()
if previous case is a match or it follows default()
valueToReturn
mapTo(mapper)
Similiar to to()
but set value by a mapper function
mapper
Function | String. If a string is passed, it will take as a path and invoke _.get(valueToTest, path)
from lodashvalue(defaultValue)
Return the value
defaultValue
Default value will return if no match is foundFAQs
Use switch and case as chainable functions
We found that switch-js demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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