(for CSE 90025 FUTURES HTML5 and JavaScript)
10 sessions
hours.
Do no harm. And other advice.
Practice Iterative Design.
Respect others. Do not distract. Do not belittle. Special care will be taken for women and minorities as they are regularly disrespected. Racism or sexism in any form will NOT be tolerated in this class!
GitHub account setup post your first code (from the first excercise) and raise an issue on the class repo introducing yourself.
DevTools Console is a sort of IDE built into every copy of Chrome
Troubleshooting and Common errors and Cuiosities in Javascript
'cat' && 'dog' what does that return? Why? How might that be useful?
'cat' || 'dog' what does that return? Why? How might that be useful?
hints: && is logical AND which needs to know that both values are true. || is logical OR and doesn't need to know the second value if the first is true. 'cat' and 'dog' both evaluate to true.
var attrib = obj && obj.subobject && obj.subobject.attribute
|| 'default'
or if attribute is just one level down, use:
var attrib = obj ? obj.attribute : 'default'
var thing = getThing(parameter) || reporterror(message)
Keeps the focus on the expected action but still handles occasional errors.
e.g.
var contents = fs.open('filename') || process.exit(1) (actually only
useful in node)
See also:
file: /Techref/language/java/script/tutorial.htm, 4KB, , updated: 2021/10/2 18:47, local time: 2024/11/8 14:29,
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Ashley Roll has put together a really nice little unit here. Leave off the MAX232 and keep these handy for the few times you need true RS232! |
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