js rest
function extractingArgs(...args){
return args[1];
}
// extractingArgs(8,9,1); // Returns 9
function addAllArgs(...args){
let sumOfArgs = 0;
let i = 0;
while(i < args.length){
sumOfArgs += args[i];
i++;
}
return sumOfArgs;
}
addAllArgs(6, 5, 7, 99); // Returns 117
addAllArgs(1, 3, 4); // Returns 8the rest operator javascript
function sum(...numbers) {
return numbers.reduce((accumulator, current) => {
return accumulator += current;
});
};
sum(1,2) // 3
sum(1,2,3,4,5) // 15js spread parameters
// seperate each element of array using ...
let list = ['a','b','c'];
let copy = [...list, 'd', 'e']; // ['a', 'b', 'c', 'd', 'e']
//use for infinite parameters to a function
function toDoList(...todos) {
//todos is an array, so it has map function
document.write(
`<ul>${todos.map((todo) => `<li>${todo}</li>`).join("")}</ul>`
);
}
toDoList("wake up", "eat breakfast", ...list); //ul containing: wake up eat breakfast a b cCopyright © 2021 Codeinu
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