The 'some condition' part corresponds to the diamond-shaped blocks in Scratch.

Javascript has the same ideas:

• 'less-than' is <
• 'greater-than' than is >
• 'equals' is a double equal-sign == (oddly enough)
• 'and' is &&
• 'or' is ||
• 'not' is !

Plus, there's some extras

• 'less-than-or-equal-to' is <=
• 'greater-than-or-equal-to' is >=
• 'not-equal-to' is !=

As always, don't worry about memorizing this stuff - you can look it up when you need it, or copy and paste samples.