Reading-1-08.md

Expressions and Operators and Loops, Oh My

Operators

Javascript contains several categories of operator, including Assignment, Comparison, Arithmetic, Bitwise, Logical, String, Conditional (ternary), Comma, Unary, and Relational. Most operators are binary, requiring two operands.

Assignment operators take a variable, do math to it, and make the resulting value the new value of the variable. Chains of assignment operators on a single line should be avoided.

Comparison operators take to variables, determine a certain relationship between them, then return a boolean output.

Loops

For Loops

A for loop is structured as follows:

for ([initialExpression]; [conditionExpression]; [incrementExpression]) 
    statement;

It executes in the following order:

1. Execute the initialExpression.
2. Check the conditionExpression. If false, leave the loop.
3. Execute the statement. If there are multiple statements, use a {block statement} to execute them all.
4. Execute incrementExpression.
5. Repeat back to step 2.

While Loops

A while loop is structured as follows:

while (conditionExpression) 
    statement;

It executes in the following order:

1. Check the conditionExpression. If false, leave the loop.
2. Execute the statement. If there are multiple statements, use a {block statement} to execute them all.
3. Repeat back to step 1.