Using Boolean prefixes for variable names
Prefixes like “is”, “has”, or “does” help emphasize that a variable holds a Boolean value.
if (monday) {
// `monday` could be the date of next Monday. You wouldn’t expect this to
// be `true` or `false`.
}
if (isMonday) {
// This reads like the question “is Monday?”, which you would answer with
// “yes” or “no”. The name tells you that this has to be Boolean.
}
if (children) {
// `children` could be a list of names or whether a person has children or
// not. It’s difficult to tell if this is an array or a Boolean.
}
if (hasChildren) {
// You can only read this as “has children?”, which is either `true` or
// `false`. Ideally.
}
if (rocks) {
// Could be the name of your favorite rocks, like “The” or “30”.
}
if (doesRock) {
// This does rock, `true`. Note how it’s not called `doesRocks`, which
// would read a little awkward.
}if (monday) {
// `monday` could be the date of next Monday. You wouldn’t expect this to
// be `true` or `false`.
}
if (isMonday) {
// This reads like the question “is Monday?”, which you would answer with
// “yes” or “no”. The name tells you that this has to be Boolean.
}
if (children) {
// `children` could be a list of names or whether a person has children or
// not. It’s difficult to tell if this is an array or a Boolean.
}
if (hasChildren) {
// You can only read this as “has children?”, which is either `true` or
// `false`. Ideally.
}
if (rocks) {
// Could be the name of your favorite rocks, like “The” or “30”.
}
if (doesRock) {
// This does rock, `true`. Note how it’s not called `doesRocks`, which
// would read a little awkward.
}if (monday) {
// `monday` could be the date of next Monday. You wouldn’t expect this to
// be `true` or `false`.
}
if (isMonday) {
// This reads like the question “is Monday?”, which you would answer with
// “yes” or “no”. The name tells you that this has to be Boolean.
}
if (children) {
// `children` could be a list of names or whether a person has children or
// not. It’s difficult to tell if this is an array or a Boolean.
}
if (hasChildren) {
// You can only read this as “has children?”, which is either `true` or
// `false`. Ideally.
}
if (rocks) {
// Could be the name of your favorite rocks, like “The” or “30”.
}
if (doesRock) {
// This does rock, `true`. Note how it’s not called `doesRocks`, which
// would read a little awkward.
}if (monday) {
// `monday` could be the date of next Monday. You wouldn’t expect this to
// be `true` or `false`.
}
if (isMonday) {
// This reads like the question “is Monday?”, which you would answer with
// “yes” or “no”. The name tells you that this has to be Boolean.
}
if (children) {
// `children` could be a list of names or whether a person has children or
// not. It’s difficult to tell if this is an array or a Boolean.
}
if (hasChildren) {
// You can only read this as “has children?”, which is either `true` or
// `false`. Ideally.
}
if (rocks) {
// Could be the name of your favorite rocks, like “The” or “30”.
}
if (doesRock) {
// This does rock, `true`. Note how it’s not called `doesRocks`, which
// would read a little awkward.
}