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object-position: which part of the photo remains visible
The position of the image can keep the important detail when cropping.
Published22 Oct 2026
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Technology
Object.assign(): later source can overwrite field
The operation changes the target object and copies shallowly.
Published22 Oct 2026
Technology
Object.entries(): properties as a list of pairs
Object.entries() converts its own enumerable text properties into pairs. This makes the crawling of settings clearer.
Published22 Oct 2026
Technology
Object.freeze(): locked container, not locked nested content
Freezing is not automatically recursive.
Published22 Oct 2026
Technology
Object.fromEntries(): back from pairs to object
Object.fromEntries() creates an object of key-value pairs. Check the repeated keys if you don't want later values to replace earlier ones.
Published22 Oct 2026
Technology
Object.hasOwn(): existing field with undefined
The presence of a property is different from the presence of a useful value.
Published22 Oct 2026
Technology
Object.is(): special cases NaN and negative zero
The comparison has small but important differences compared with ===.
Published22 Oct 2026
Technology
Object.keys(): names of own enumerable properties
Inherited properties do not automatically enter the list.
Published22 Oct 2026
Technology
Object.values(): values without their names
When converting, the direct connection to the keys in the received array is lost.
Published22 Oct 2026
Technology
Optional chaining: access to a property that may be missing
The ?. operator terminates access at null or undefined. It does not hide arbitrary errors in performance.
Published22 Oct 2026
Technology
Os.environ: settings from the process environment
os.environ exposes process environment variables as text. A configured port, for example, needs conversion and validation before being used as a number.
Published22 Oct 2026
Technology
outline and border: the difference in box size
The contour can highlight an element without changing the arrangement.
Published22 Oct 2026