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December 22, 2016 18:39
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Building a Function: An accumulator pattern refers to a function that follow these steps: | |
1. Identify the inputs. | |
1a. Array: [], string "", object: {}, number: 0, bollean: true/false | |
2. Write a function definition with those inputs. | |
2a. define parameters () | |
2b. function call/invoking: function(arguments) | |
3. Identify the output, define the result variable, and return it. | |
3a. Declare output type: result; default , result = [] array, result = {} object, result = 0 num result = "" string | |
3b. return statement - return result (one picked from above) | |
4. Determine how to iterate. | |
4a. Which loop - for, while, while/do, for -in (Objects) | |
5. Changes the data somehow. This is the trickey part | |
5a. Do you need conditionals(if/elseif/else) - comparisions | |
5b. Modelo %: Do we need even/odd/remainder - even (num % 2 === 0) , odd(num %2 !== 0) | |
5b. Add: result += (array[i]) (num) (string[i]) - also consider *= /= | |
5c. Array: result.push(array[i]) - also consider slice | |
5d. Object: result[object[key] = [i] | |
5e. String: result = result + items[i] concatenation | |
// 16. Write a conditional statement to find the largest of the numbers in the array provided. | |
var num = [-5, -2, -6, 0, -1]; | |
var largestNum = num[0]; | |
for (var i = 1; i < num.length; i++) { | |
if (num[i] > largestNum) { | |
largestNum = num[i]; | |
} | |
} | |
// 9. FIZZ BUZZ | |
// Write a program that uses console.log to print each number up to 100, with a couple exceptions... | |
// If the number is divisible by 3, print "Fizz" instead of the number. | |
// If the number is divisible by 5, print "Buzz" instead of the number. | |
// If the number is divisible by both 3 and 5, print "FizzBuzz" instead of the number. | |
for (var i = 0; i < 100; i++) { | |
if (i % 3 === 0 && i % 5 === 0) { | |
console.log("FizzBuzz"); | |
document.getElementById("q9").innerHTML += "<p>FizzBuzz</p>"; | |
} else if (i % 3 === 0 && !(i % 5 === 0)) { | |
console.log("Fizz"); | |
document.getElementById("q9").innerHTML += "<p>Fizz</p>"; | |
} else if (i % 5 === 0 && !(i % 3 === 0)) { | |
console.log("Buzz"); | |
document.getElementById("q9").innerHTML += "<p>Buzz</p>"; | |
} else { | |
console.log(i); | |
document.getElementById("q9").innerHTML += "<p>" + i + "</p>"; | |
} | |
// HEADS OR TAILS? | |
// 17. Use the following variable for your coin flip action: | |
var coin = Math.floor(Math.random() * 2); | |
if (coin === 0) { | |
var result = "heads"; | |
} else { | |
var result = "tails"; | |
} | |
console.log(result); | |
document.getElementById("q17").innerHTML += "<p>" + result + "</p>"; | |
// 5. You use Amazon Subscribe & Save to have six cans of cashews automatically sent to you each month. | |
// Write a function that takes the price per unit and calculates the total for you each month. | |
// Since the price of the cashews can change anytime, pass that amount into the function to get your total price. | |
function totalCost(price, amount) { | |
return (price * amount); | |
} | |
totalCost(input1, input2)); | |
// 1. Without using Math.min(), write a function called minimum(), | |
// that takes two numbers from a user, | |
// and outputs the smaller number into the HTML page. | |
function minimum (num1, num2) { | |
if (num1 === num2) { | |
return("same number"); | |
} else if (num1 < num2) { | |
return(num1); | |
} else if (num1 > num2) { | |
return(num2); | |
} else { | |
return("incorrect input"); | |
} | |
} | |
var exampleArray = [1, 2, 3, 4]; | |
function sum(array) { | |
var result = 0; | |
for (var i = 0; i < array.length; i++) { | |
result += array[i]; | |
} | |
return result; | |
} | |
/ 8. Write a function countBs() that takes a string as its only argument and returns | |
// a number that indicates how many uppercase “B” characters are in the string. | |
// HINT: Google charAt() | |
function countBs(string) { | |
var count = 0; | |
for (var i = 0; i < string.length; i++) { | |
if (string.charAt(i) === "B"); | |
count++; | |
} | |
return count; | |
} |
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