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functionally
Advanced tools
Functionally - A utility belt for functional JavaScript
$ npm install functionally
var F = require('functionally')
function log(msg){
console.log(msg)
}
function greet(name){
return 'Hello ' + name + '!'
}
var logGreeting = F.compose(log, greet)
logGreeting('Bob') //console.log('Hello Bob!')
Returns the first object in target for which fn returns a truthy value.
Example
F.find(function(obj){
return obj.name == 'js'
}, [
{name: 'ruby'},
{name: 'js'},
{name: 'php'},
{name: 'erlang'}
])
//returns the second object in the array
The find
function is curried, so you can do
var findFirst = F.find(function(value, index, target){
if (index === 0){
return value
}
})
findFirst([4,5,6]) == 4
Returns a function that calls fn just once.
Example
var counter = 0
var inc = F.once(function(){
counter++
})
inc()
counter == 1
inc()
inc()
counter == 1
The function returned by once returns the result of the original function. On subsequent calls, returns the same result.
If you use parseInt as the parameter to array.map, you get an undesired result
['1','2','3'].map(parseInt)
//[1, NaN, NaN]
But if you use maxArgs:
var parseInt = F.maxArgs(parseInt, 1)
['1','2','3'].map(parseInt)
//you get [1,2,3], the expected result
Creates a new curried function that calls the given fn with the new operator. Expected args are the fn to use for calling new and an array of args to be used (they will be spread on the new call).
Example:
function Developer(name, language){
this.name = name
this.lang = language
}
var newDev = newify(Developer)
var dev = newDev(['bob', 'js'])
var dev2 = newify(Developer, ['john', 'c#'])
dev instanceof Developer === true
dev2 instanceof Developer === true
FAQs
Functionally - A utility belt for functional JavaScript
The npm package functionally receives a total of 232 weekly downloads. As such, functionally popularity was classified as not popular.
We found that functionally 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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