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58 lines (51 loc) · 1.75 KB
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const getFirstItem = (collection, cb) => {
cb(collection[0]);
// invoke the callback function and pass the first item from the collection in as an argument
};
const getLength = (collection, cb) => {
cb(collection.length);
// Write a function called getLength that passes the length of the array into the callback
};
const getLastItem = (collection, cb) => {
cb(collection[collection.length - 1]);
// Write a function called getLastItem which passes the getLastItem item of the array into the callback
};
const sumNums = (x, y, cb) => {
cb(x + y);
// Write a function called sumNums that adds two numbers and passes the result to the callback
};
const multiplyNums = (x, y, cb) => {
cb(x * y);
// Write a function called multiplyNums that multiplies two numbers and passes the result to the callback
};
const contains = (collection, item, cb) => {
let isPresent = false;
for (let i = 0; i < collection.length; i++) {
if (collection[i] === item) {
isPresent = true;
}
} cb(isPresent);
// Write a function called contains that checks if an item is present inside of the given array.
// Pass true to the callback if it is, otherwise pass false
};
const removeDuplicates = (collection, cb) => {
const newArray = collection.slice();
for (let i = 0; i < newArray.length; i++) {
for (let j = i + 1; j < newArray.length; j++) {
if (newArray[i] === newArray[j]) {
newArray.splice(j, 1);
}
}
} cb(newArray);
// Write a function called removeDuplicates that removes all duplicate values from the given array.
// Pass the array to the callback function. Do not mutate the original array.
};
module.exports = {
getFirstItem,
getLength,
getLastItem,
sumNums,
multiplyNums,
contains,
removeDuplicates
};