Term
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Definition
if (condition) {
//Do something
}
else { //Otherwise...
// Do something else!
} |
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Term
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Definition
var something = function(name){
console.log("Hello, " + name);
};
something("Jonathan") |
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Term
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Definition
for (start; end; increment){
//Do something!
}
Ex:
for (i = 100; i >= 1; i -= 5){
console.log(i) |
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Term
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Definition
var something = [];
var junk = ["ball", "stick", 100, 2];
console.log(junk); will display the list
junk[0]; will display the first element in the array |
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Term
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Definition
var names = ["John", "Cody", "Steve"]
for (i = 0; i < 3; i++){
console.log("I people who are called", names[i]);
] |
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Term
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Definition
while(condition){
//Do something!
//be sure to close/set a while loop to be untrue after a certain point
}
var understand = true;
while(understand === 1){
console.log("I'm learning while loops!");
understand = false;
}
console.log("I'm learning while loops!"); |
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Term
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Definition
do {
//The thing to do at least once!
} while( /* some condition */ );
var loopCondition = false;
do {
console.log("I'm gonna stop looping 'cause my condition is " + loopCondition + "!");
} while(loopCondition); |
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Term
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Definition
| youHit to Math.floor(Math.random() * 2). This sets youHit to a random number that's either 0 (which JavaScript reads as false) or 1 (which JavaScript reads as true). |
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Term
| Math.floor(Math.random() *5 + 1); |
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Definition
First we use Math.random() to create a random number from 0 up to 1. For example, 0.5
Then we multiply by 5 to make the random number from 0 up to 5. For example, 0.5 * 5 = 2.5
Next we use Math.floor() to round down to a whole number. For example, Math.floor( 2.5 ) = 2
Finally we add 1 to change the range from between 0 and 4 to between 1 and 5 (up to and including 5) |
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Term
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Definition
Takes the variable in front of += and add the variable after it together.
from:
totalDamage = totalDamage + damageThisRound
to:
totalDamage += damageThisRound |
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Term
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Definition
var slaying = true;
var youHit = Math.floor(Math.random() * 2);
var damageThisRound = Math.floor(Math.random() * 5 + 1);
var totalDamage = 0
while(slaying){
if(youHit){
console.log("You have struck the dargon ferociusly! Kee-Ya!!");
totalDamage += damageThisRound;
if(totalDamage >= 4){
console.log("This dargon has doth been slain!");
slaying = false;
}
else{
youHit = Math.floor(Math.random() * 2);
}
}
else{
console.log("The dargon evaded the attack!");
}
slaying = false;
}; |
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Term
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Definition
Is Not a Number
isNaN("butts"); // => true
isNaN(42); // => false
Be careful: if you call isNaN on a string that looks like a number, like '42', JavaScript will try to help by automatically converting the string '42' to the number 42 and return false (since 42 is a number) |
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Term
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Definition
Allows you to preset a number of options (called cases), then check an expression to see if it matches any of them. If there's a match, the program will perform the action for the matching case; if there's no match, it can execute a default option.
var lunch = prompt("What do you want for lunch?","Type your lunch choice here");
switch(lunch){
case 'sandwich':
console.log("Sure thing! One sandwich, coming up.");
break;
default:
console.log("Huh! I'm not sure what " + lunch + " is. How does a sandwich sound?");
} |
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Term
|
Definition
switch (/*Some expression*/) {
case 'option1':
// Do something
break;
case 'option2':
// Do something else
break;
case 'option3':
// Do a third thing
break;
default:
// Do yet another thing
} |
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Term
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Definition
| var variableName = prompt("Question to the user"); |
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Term
.toUpperCase()
.toLowerCase() |
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Definition
converts all the user's answer to ALL CAPS or all lowercase before saving it in the variable.
var variableName= prompt("Question to the user").toUpperCase(); |
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Term
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Definition
When you call .length on an array, it returns the number of elements the array has.
var array = ["butts", " farts", 69];
console.log(array.length)
answer is '3' |
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Term
| Iterating over an array. Combining arrays with a for loop and displaying the array as a list |
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Definition
var languages = ["HTML", "CSS", "JavaScript", "Python", "Ruby"];
for(var i = 0; i console.log(languages[i]);
}; |
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Term
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Definition
An array that containts integers and strings
var hetero = ["one", 2, "three"]; |
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Term
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Definition
An array that contains another array.
var multiArray = [["wow", "much wow"], [1, 853]]; |
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Term
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Definition
A variation on the multidimensional array where each array contains a different number of elements
var jagged = [["fifty five", 55, "shfifty fhive"], [1, 54], "much array"]; |
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Term
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Definition
var myObj = {
key1 = value,
key2 = value
}; |
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Term
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Definition
var myObj = new Object();
myObj.key1 = value;
OR
myObj['key2'] = value; |
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