Exercises: Arrays

Your top choices

• Create an array to hold your top choices (colors, food, whatever).
• For each choice, log to the screen a string like: "My #1 choice is blue."
• Bonus: Change it to log "My 1st choice, "My 2nd choice", "My 3rd choice", picking the right suffix for the number based on what it is.

See Solution

var choices = ['red', 'orange', 'pink', 'yellow'];
for (var i = 0; i < choices.length; i++) {
    console.log('My #' + (i + 1) + ' choice is ' + choices[i]);
}

for (var i = 0; i < choices.length; i++) {
    var choiceNum = i + 1;
    var choiceNumSuffix;
    if (choiceNum == 1) {
        choiceNumSuffix = 'st';
    } else if (choiceNum == 2) {
        choiceNumSuffix = 'nd';
    } else if (choiceNum == 3) {
        choiceNumSuffix = 'rd';
    } else {
        choiceNumSuffix = 'th';
    }
    console.log('My ' + choiceNum + choiceNumSuffix + ' choice is ' + choices[i]);
}

First and Last

• Write a JavaScript function called first() that takes one input, an array, and returns the first element in that array
• Write another JavaScript function called last() that takes one input, an array, and returns the lastt element in that array

See Solution

function first(array) {
  return array[0];
}

function last(array) {
  return array[array.length - 1];
}

Longest String

• Given an array of strings, find the longest string and print out that string.
• hint: strings also have the .length property - i.e `"starburst".length` is 9

See Solution

var strings = ["word", "wordier", "wordiest", "foo"];
var longestString = "";

for(var i = 0; i < strings.length; i++) {
  var currentString = strings[i];
  if(currentString.length > longestString.length) {
    longestString = currentString;
  }
}
console.log("The longest string is " + longestString + ". It has " + longestString.length + " letters.");