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@revanth0212
Last active September 12, 2019 17:06
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Custom implementation of Ramda's Compose Function without any dependencies. This function has been implemented with tail recursion, so no more stack overflow issues.
/**
* Compose function
*/
function _compose(functions, param) {
const lastFunction = functions.pop();
const result = lastFunction.call(null, param);
return functions.length === 0 ? result : _compose(functions, result);
}
function compose(...functions) {
const lastFunction = functions.pop();
return function(...initalParams) {
const result = lastFunction.apply(null, initalParams);
return functions.length === 0 ? result : _compose(functions, result);
};
}
module.exports = { compose }
/**
* Sample functions
*/
function getAge({ age }) {
return age;
}
function head(arr) {
return arr[0];
}
function filterUser(userName) {
return function(users) {
return users.filter(({ name }) => userName === name);
};
}
/**
* Data
*/
const users = [
{
name: "Jed",
age: 25
},
{
name: "Revanth",
age: 25
}
];
/**
* Example
*/
compose(
console.log,
getAge,
head,
filterUser("Jed")
)(users);
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