Variable Practice
We've already covered basic mathematical operations:
4 + 5 // returns 9
Variables can be used in place of values when performing mathematical operations:
var firstNumber = 4;
var secondNumber = 5;
firstNumber + secondNumber // returns 9
Strings can also be combined with the + operator. This is called string concatenation:
"Bart" + " Simpson" // returns "Bart Simpson"
Multiple strings can be concatenated:
"Bart " + "JoJo" + " Simpson" // returns "Bart JoJo Simpson"
Variables can also be used with string concatenation:
var first = "Homer";
var last = "Simpson";
first + " " + last // "Homer Simpson"
| Question | Click to View Answer |
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Assign the variable yy to the value "i like ". Assign the variable zz to the value "whales". Concatenate the two variables and print the result to the console. |
var yy = "i like ";
var zz = "whales";
console.log(yy + zz);
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Assign the variable birthYear to the value 1970. Assign the variable singularityYear to 2032. Subtract birthYear from singularityYear and print the result to the console. |
var birthYear = 1970;
var singularityYear = 2032;
console.log(singularityYear - birthYear);
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