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Code 102, Intro to Software Development

Class 08 - Reading Notes

   

Operators and Loops

 

Operators

Summarized from MDN Web Docs

 

Comparison Operators

A comparison operator compares its operands and returns a logical value based on whether the camparison is true.

 

Operands can be: numerical, string, logical, or object values.

 

Types of Comparison Operators

 

== Equal

!= Not equal

=== Strict equal

!== Strict not equal

> Greater than

>= Greater than or equal to

< Less than

<= Less than or equal to

 

Assignment Operators

 

An assignment operator assigns a value to its left operand based on the value of its right operand. The simple assignment operator is =, which assigns the value of its right operand to its left operand. x = f() is an assignment expression that assigns the falue of f() to x.

 

Loops

Summarized from MDN Web Docs

 

For Statements

A for loop repeats until a specified condition evaluates to false.

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

 

While Statements

A while statement executes its statements as long as a specified condition evaluates to true.

 

A while statement looks as follows:

while (condition)
statement

 

If the condition becomes false, statement within the loop stops executing and control passes to the statement following the loop.

The condition test occurs before statement in the loop is executed. If the condition returns true, statement is executed and the condition is tested again. If the condition returns false, execution stops, and control is passed to the statement following while.

   

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