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const sum = (a, b) => a + b;
const not = (value) => !value;
const isEven = (number) => number % 2 == 0;
console.log("sum(4, 2) == " + sum(4,2));
console.log("not(true) == " + not(true));
console.log("isEven(4) == " + isEven(4));
console.log("isEven(7) == " + isEven(7));
const twice = (fn) => (a) => fn(a, a);
const double = twice(sum);
console.log("double(5) == " + double(2));
console.log("double(5) == " + double(5));
console.log("double(5) == " + double(10));
const apply = (fn1) => (fn2) => (number) => fn1(fn2(number));
const negate = apply(not);
const isOdd = negate(isEven);
console.log("isOdd(4) == " + isOdd(4));
console.log("isOdd(7) == " + isOdd(7));
console.log("isOdd(4) == " + apply(not)(isEven)(4));
console.log("isOdd(7) == " + apply(not)(isEven)(7));
/*
$.get("/getUser", {
userName: "maria"
}, (data) => setPageTitle(data.fullName));
// user properties library
const getFullName = (fn) => (data) => fn(data.fullName);
$.get("/getUser", { userName: "maria" }, getFullName(setPageTitle));
*/
const sum2 = (a) => (b) => a + b;
console.log("sum2(4)(2) == " + sum2(4)(2));
add10 = sum2(10);
console.log("add10(5) == " + add10(5));
const biggerThan = (a) => (b) => a < b;
console.log("biggerThan(1)(10) == " + biggerThan(1)(10));
const map = (fn) => (list) => {
let newList = [];
for( let i = 0; i < list.length; i++) {
newList.push(fn(list[i]));
}
return newList;
};
console.log("map(add10)([1,2,3]) == " + map(add10)([1,2,3]));
const add10ToList = map(add10);
console.log("add10ToList([5,10,15]) == " + add10ToList([5,10,15]));
const reduce = (fn) => (list) => {
let result = fn(list[0], list[1]);
for( let i = 2; i < list.length; i++) {
result = fn(result, list[i]);
}
return result;
};
console.log("reduce(sum)([1,2,3,4,5]) == " + reduce(sum)([1,2,3,4,5]));
const sumAll = reduce(sum);
console.log("sumAll([1,2,3,4,5]) == " + sumAll([1,2,3,4,5]));
const filter = (fn) => (list) => {
let newList = [];
for(let i = 0; i < list.length; i++) {
if(fn(list[i])) {
newList.push(list[i]);
}
}
return newList;
};
const getOdd = filter(isOdd);
console.log("getOdd([1,2,3,4,5]) == " + getOdd([1,2,3,4,5]));
Owner

fmsf commented Jul 2, 2016

talk given in http://commitporto.com/ 2016

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