- Tags: Conditional
- Categories: JavaScript Reference, JavaScript Resources, Reference
Quick Reference
This is a quick reference list of JavaScript statements with examples of how they are used.
JavaScript – break Statement
The break statement stops code execution within the switch, and also breaks out of a loop, continuing to execute code that comes after the loop.
JavaScript – class Statement
The class statement initiates a class with properties and methods assigned in the constructor() method.
JavaScript – const Statement
The const statement declares a variable (container for storing information) with an immediately defined value that will not change.
JavaScript – continue Statement
The continue statement breaks an iteration in the loop, if a specified condition occurs, and then continues with the next iteration in the loop.
JavaScript – debugger Statement
The debugger statement stops the execution of a script and calls the debugger. If debugging is unavailable, the statement has no effect.
JavaScript – do…while Statement
The do…while statement defines a code block to be executed at least once, and repeated as long as a condition is true.
JavaScript – for Statement
The for statement defines a block of code to be executed as long as a specified condition is true.
JavaScript – for…in Statement
The for…in statement loops over the properties of an object, executing a block of code inside the loop once for each item found.
JavaScript – for…of Statement
The for…of statement loops over the values of any iterable, executing a block of code inside the loop once for each item found.
JavaScript – function Statement
The function statement declares a function to be executed later, when it is called. Functions are objects, and have both properties and methods.
JavaScript – if…else Statement
The if…else statement executes a block of code if a specified condition is true, and optionally, another block of code if false.
JavaScript – let Statement
The let statement declares a variable (container for storing information), and can be empty when declared, with the value assigned later.
JavaScript – switch Statement
The switch statement executes different blocks of code depending on set conditions, and uses the break keyword to break out of the switch block.
JavaScript – throw Statement
The throw statement allows you to generate a custom error (throw an exception), which can be a String, a Number, a Boolean, or an Object.
JavaScript – try…catch…finally Statement
The try…catch…finally statement handles errors without stopping JavaScript to output the error.
JavaScript – var Statement
The var statement declares a variable (container for storing information), and can be empty when declared, with the value assigned later.
JavaScript – while Statement
The while statement defines a code block to be executed for as long as a condition is true.
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JAVASCRIPT NOTES:
- When using JavaScript, single or double quotation marks are acceptable and work identically to one another; choose whichever you prefer, and stay consistent
- JavaScript is a case-sensitive language; firstName is NOT the same as firstname
- Arrays count starting from zero NOT one; so item 1 is position [0], item 2 is position [1], and item 3 is position [2] … and so on
- JavaScript variables must begin with a letter, $, or _
- JavaScript variables are case sensitive (x is not the same as X)
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