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callbacks.js
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137 lines (96 loc) · 2.51 KB
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// Create a callback function and invoke the function to test your work. You have been provided an example of a problem and a solution to see how this works with our items array. Study both the problem and the solution to figure out the rest of the problems.
const items = ['Pencil', 'Notebook', 'yo-yo', 'Gum'];
/*
//Given this problem:
function firstItem(arr, cb) {
// firstItem passes the first item of the given array to the callback function.
}
// Potential Solution:
function firstItem(arr, cb) {
return cb(arr[0]);
}
firstItem(items, function(first) {
console.log(first)
});
*/
function getLength(arr, cb) {
return cb(arr.length)
}
function findLength()
getLength(items, function(length) {
return length
})
function last(arr, cb) {
return cb(arr[arr.length - 1])
}
last(items, function(getLast) {
return getLast
})
function sumNums(x, y, cb) {
return cb(x + y)
// sumNums adds two numbers (x, y) and passes the result to the callback.
}
sumNums(1, 1, function(getSum) {
return getSum
})
function multiplyNums(x, y, cb) {
return cb(x * y)
// multiplyNums multiplies two numbers and passes the result to the callback.
}
multiplyNums(3, 3, function(getSum) {
return getSum
})
function contains(item, list, cb) {
if (list.find(b => b === item)) {
return cb(true)
} else {
return cb(false)
}
}
contains(2, items, function(a) {
return a
})
// contains checks if an item is present inside of the given array/list.
// Pass true to the callback if it is, otherwise pass false.
function contains(item, list, cb) {
return cb(item, list)
}
contains('Gum', items, function(trueOrFalse) {
for (let i = 0; i < items.length; i++) {
if (arguments[0] === items[i]) {
return true
}
}
return false
})
function contains(item, list, cb) {
for (let i = 0; i < items.length; i++) {
if (arguments[0] === items[i]) {
return true
}
}
return false
}
/* STRETCH PROBLEM */
function removeDuplicates(arr, cb) {
return arr = cb([...new Set(arr)])
}
removeDuplicates(items, function(a) {
return a
})
function removeDuplicates(array, cb) {
return cb([...new Set(array)])
}
removeDuplicates(items, function(nonDuplicate) {
return nonDuplicate
})
function removeDuplicates(arr, cb) {
return cb(arr)
}
function remover(arr) {
return arr = [...new Set(arr)]
}
removeDuplicates(a, function() {
let b = [...new Set(a)]
return b
})