Commit 3b65634

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Badacadabra

committed

Add Currying (ES5 + ES6 + CoffeeScript + TypeScript)

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Lines changed: 16 additions & 0 deletions

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	`1`	`+profile = (firstName) ->`
	`2`	`+ (lastName) ->`
	`3`	`+ (age) ->`
	`4`	`+ (gender) ->`
	`5`	`+ (nationality) ->`
	`6`	`+ """`
	`7`	`+ First name: #{firstName}`
	`8`	`+ Last name: #{lastName}`
	`9`	`+ Age: #{age}`
	`10`	`+ Gender: #{gender}`
	`11`	`+ Nationality: #{nationality}`
	`12`	`+ """`
	`13`	`+`
	`14`	`+myProfile = profile("Baptiste")("Vannesson")(27)("M")("French")`
	`15`	`+`
	`16`	`+console.log myProfile`

Lines changed: 21 additions & 0 deletions

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	`1`	`+var profile = function (firstName) {`
	`2`	`+ return function (lastName) {`
	`3`	`+ return function (age) {`
	`4`	`+ return function (gender) {`
	`5`	`+ return function (nationality) {`
	`6`	`+ var str = "";`
	`7`	`+ str += "First name: " + firstName;`
	`8`	`+ str += "\nLast name: " + lastName;`
	`9`	`+ str += "\nAge: " + age;`
	`10`	`+ str += "\nGender: " + gender;`
	`11`	`+ str += "\nNationality: " + nationality;`
	`12`	`+ return str;`
	`13`	`+ };`
	`14`	`+ };`
	`15`	`+ };`
	`16`	`+ };`
	`17`	`+};`
	`18`	`+`
	`19`	`+var myProfile = profile("Baptiste")("Vannesson")(27)("M")("French");`
	`20`	`+`
	`21`	`+console.log(myProfile);`

Lines changed: 17 additions & 0 deletions

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	`1`	`+const profile = firstName => {`
	`2`	`+ return lastName => {`
	`3`	`+ return age => {`
	`4`	`+ return gender => {`
	`5`	+ return nationality => `First name: ${firstName}
	`6`	`+Last name: ${lastName}`
	`7`	`+Age: ${age}`
	`8`	`+Gender: ${gender}`
	`9`	+Nationality: ${nationality}`
	`10`	`+ };`
	`11`	`+ };`
	`12`	`+ };`
	`13`	`+};`
	`14`	`+`
	`15`	`+let myProfile = profile("Baptiste")("Vannesson")(27)("M")("French");`
	`16`	`+`
	`17`	`+console.log(myProfile);`

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	`1`	`+# Problem`
	`2`	`+`
	`3`	`+Functions may have a high arity, which means that they can accept a lot of arguments. This is not optimal for at least two reasons:`
	`4`	`+`
	`5`	`+ 1. Keeping a nice-looking indentation is hard if the list of parameters is really long`
	`6`	`+ 2. It is difficult for the programmer to remember the order of many positional parameters`
	`7`	`+`
	`8`	`+# Solution`
	`9`	`+`
	`10`	`+We can use currying to reduce the arity of a function. The aim of this pattern is to transform a function with many parameters into multiple functions with only one parameter.`
	`11`	`+Since JavaScript is an extremely flexible language, the only thing to do is to create a sort of "return chain" where each function returns another function (with only one parameter) until the number of parameters is exhausted.`

Lines changed: 17 additions & 0 deletions

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	`1`	`+const profile = (firstName: string) => {`
	`2`	`+ return (lastName: string) => {`
	`3`	`+ return (age: number) => {`
	`4`	`+ return (gender: string) => {`
	`5`	+ return (nationality: string) => `First name: ${firstName}
	`6`	`+Last name: ${lastName}`
	`7`	`+Age: ${age}`
	`8`	`+Gender: ${gender}`
	`9`	+Nationality: ${nationality}`
	`10`	`+ };`
	`11`	`+ };`
	`12`	`+ };`
	`13`	`+};`
	`14`	`+`
	`15`	`+let myProfile: string = profile("Baptiste")("Vannesson")(27)("M")("French");`
	`16`	`+`
	`17`	`+console.log(myProfile);`

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