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callbacks.js
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70 lines (48 loc) · 1.41 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)
}
getLength(items, function(leng) {
console.log(len);
});
function last(arr, cb) {
return cb(arr[3])
}
last(items, function(end){
console.log(end)
})
function sumNums(x, y, cb) {
return cb(x + y)
}
sumNums(67, 90, function(add){
console.log(add)
})
function multiplyNums(x, y, cb) {
return cb(x * y)// multiplyNums multiplies two numbers and passes the result to the callback.
}
multiplyNums(39, 5, function(multiply){
console.log(multiply);
})
function contains(item, list, cb) {
return cb(item === list)
}
contains('Pencil', items, function (x){
console.log(x)
} )
// contains checks if an item is present inside of the given array/list.
// Pass true to the callback if it is, otherwise pass false.
/* STRETCH PROBLEM */