Created
November 29, 2017 05:53
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// https://repl.it/@robertaxelkirby/Accessing-array-items-drill | |
function accessFirstItem(array) { | |
return array[0]; | |
} | |
function accessThirdItem(array) { | |
return array[2]; | |
} | |
/* From here down, you are not expected to | |
understand.... for now :) | |
Nothing to see here! | |
*/ | |
// tests | |
function testFunctionWorks(fn, input, expected) { | |
if (fn(input) === expected) { | |
console.log(`SUCCESS: "${fn.name}" works on [${input}]`); | |
return true; | |
} else { | |
console.log( | |
`FAILURE: ${fn.name}([${input}]) should be ${expected} but was ${fn( | |
input | |
)}` | |
); | |
return false; | |
} | |
} | |
function runTests() { | |
var list = [1, 4, 9, 16, 25]; | |
var item1 = 1; | |
var item2 = 9; | |
var testResults = [ | |
testFunctionWorks(accessFirstItem, list, item1), | |
testFunctionWorks(accessThirdItem, list, item2), | |
]; | |
var numPassing = testResults.filter(function(result) { | |
return result; | |
}).length; | |
console.log(numPassing + ' out of ' + testResults.length + ' tests passing.'); | |
} | |
runTests(); |
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// https://repl.it/@robertaxelkirby/Adding-array-items-drills | |
function addToList(list, item) { | |
list.push(item); | |
return list; | |
} | |
/* From here down, you are not expected to | |
understand.... for now :) | |
Nothing to see here! | |
*/ | |
// tests | |
function testAddToList() { | |
const input1 = ['red', 'blue', 'green']; | |
const input2 = 'pink'; | |
const expected = ['red', 'blue', 'green', 'pink']; | |
const result = addToList(input1, input2); | |
if ( | |
result && | |
result.length && | |
expected.length === result.length && | |
expected.every(function(item) { | |
return result.indexOf(item) > -1; | |
}) | |
) { | |
console.log('SUCCESS: `addToList` works!'); | |
} else { | |
console.error('FAILURE: `addToList` is not working'); | |
} | |
} | |
testAddToList(); |
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// https://repl.it/@robertaxelkirby/Array-length-and-access-drill | |
function findLength(array) { | |
return array.length; | |
} | |
function accessLastItem(array) { | |
return array[array.length-1]; | |
} | |
/* From here down, you are not expected to | |
understand.... for now :) | |
Nothing to see here! | |
*/ | |
// tests | |
function testFunctionWorks(fn, input, expected) { | |
if (fn(input) === expected) { | |
console.log('SUCCESS: `' + fn.name + '` works on `[' + input + ']`'); | |
return true; | |
} else { | |
console.error( | |
'FAILURE: `' + | |
fn.name + | |
'([' + | |
input + | |
'])` should be ' + | |
expected + | |
' but was ' + | |
fn(input) | |
); | |
return false; | |
} | |
} | |
function runTests() { | |
const list = [1, 4, 9, 16, 25]; | |
const originalList = [1, 4, 9, 16, 25]; | |
const length = 5; | |
const lastItem = 25; | |
const testResults = [ | |
testFunctionWorks(findLength, list, length), | |
testFunctionWorks(accessLastItem, list, lastItem), | |
]; | |
const numPassing = testResults.filter(function(result) { | |
return result; | |
}).length; | |
console.log(numPassing + ' out of ' + testResults.length + ' tests passing.'); | |
} | |
runTests(); |
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// https://repl.it/@robertaxelkirby/Creating-arrays-drill | |
function makeList(item1, item2, item3) { | |
return [item1, item2, item3]; | |
} | |
/* From here down, you are not expected to | |
understand.... for now :) | |
Nothing to see here! | |
*/ | |
// tests | |
function testMakeList() { | |
const items = ['prime rib', 'fried goat cheese salad', 'fish tacos']; | |
const result = makeList(items[0], items[1], items[2]); | |
if ( | |
result && | |
result.length && | |
items.length === result.length && | |
items.every(function(item) { | |
return result.indexOf(item) > -1; | |
}) | |
) { | |
console.log('SUCCESS: `makeList` works!'); | |
} else { | |
console.error('FAILURE: `makeList` is not working'); | |
} | |
} | |
testMakeList(); |
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