Class9 higherorder #10
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reneemeyer
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reneemeyer
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Eric, good start, but you need to work out some of the kinks in these functions. Remember, the purpose of functions in JS is re-usability and the ability to return data. We don't want to hard code any data into a function.
| function forEach(arr, callback) { | ||
| // Your code here | ||
| // create an array with whatever you want in it | ||
| const arrProblemOne = [1, 2, 3] |
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| //make a for loop that runs the number of items in the array amount of times. | ||
| //make a variable that prints a phrase the amount of times defined by the for loop | ||
| for (let i = 0; i < arrProblemOne.length; i++) { |
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Your for loop should loop around the arr that the user passes in, not a hard coded array.
| //make a for loop that runs the number of items in the array amount of times. | ||
| //make a variable that prints a phrase the amount of times defined by the for loop | ||
| for (let i = 0; i < arrProblemOne.length; i++) { | ||
| callback(); |
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Each item needs to be passed into the callback.
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| const assert = require('assert'); | ||
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| function forEach(arr, callback) { |
| function map(arr, callback) { | ||
| // Your code here | ||
| // Create an array, put whatever you want in it | ||
| const test = ['1', '2', '3', '4', '5', '6']; |
| //doThis(), a function that creates a new array, then does whatever function you want when you call doThis to the original array | ||
| //pushes the result of the called function to the new array | ||
| //print out the new array | ||
| const doThis = (arr, callBackFunction) => { |
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what is the purpose of this internal function?
| //print out the new array | ||
| const doThis = (arr, callBackFunction) => { | ||
| const newArr = []; | ||
| test.forEach((i) => { |
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your forEach should loop around the array passed, not a hardcoded array.
| test.forEach((i) => { | ||
| newArr.push(callBackFunction(i)); | ||
| }); | ||
| console.log(newArr); |
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you should return the newArr, not console log it
| //a new, empty array accepts the results of the function | ||
| const filtered = (arrTwo, callbackTwo) => { | ||
| const arrResultThree = []; | ||
| if (callbackTwo(arrTwo[i])) arrResultThree.push(arrTwo[i]) |
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Where is i defined? This doesn't make any sense. Also where did longestWords come from? Please follow the exact directions. This function should take an array and a function as arguments. It should return an array with only the items that return true in the function. Don't use hard coded arrays or functions.
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Checkpoint 2
Checkpoint 3