}
		}
		dst.KVS = append(dst.KVS, jstream.KV{
			Key:   elem.Name,
			Value: v,
		})
	}
	return dst, nil
}

// Set - sets the value for a column name.
func (r *Record) Set(name string, value *sql.Value) (sql.Record, error) {
	dst, err := r.CloneTo(nil)
	if err != nil {
		return nil, err
	}
	return dst.Set(name, value)
}

// WriteCSV - encodes to CSV data.

</div>

This means that it will **always have a value**, it's just that sometimes the value could be `None` (or `null` in JSON).

That means that, clients using your API don't have to check if the value exists or not, they can **assume the field will always be there**, but just that in some cases it will have the default value of `None`.

fun buildScanCustomValueParam(
    key: String,
    value: String,
) = """-Dscan.value.$key=$value"""

fun TestCoverage.asBuildScanCustomValue() =
    testType.name.toCamelCase().toCapitalized() +
        testJvmVersion.toCapitalized() +
        "${vendor.displayName}${os.asName()}${arch.asName()}"

// Generates a Build Scan custom value "PartOf=X,Y,Z"
// where X, Y, Z are all the stages including current stage

        joiner.setEmptyValue("");
        for (Path p : paths) {
            joiner.add(p.toString());
        }
        String value = joiner.toString();
        if (value.isEmpty()) {
            return new String[0];
        }
        return new String[] {option, value};
    }

    /**
     * {@return a string representation of this path type for debugging purposes}.
     */
    @Override

         * an array and when a value is potentionally overriden it is added to the array. The single
         * arg option value is retrieved and instead of returning values[values.length-1] it returns
         * values[0] which means that the original value instead of the overridden one is returned
         * (first wins). With properties values are truely overriden since at the end a map is used

    }

    /**
     * This method is needed to "align" values used later on for interpolations and path calculations.
     * We enforce "canonical" paths, so IF key and canonical path value disagree, let override it.
     */
    protected void mayOverrideDirectorySystemProperty(LocalContext context, String javaSystemPropertyKey, Path value) {
        String valueString = value.toString();

     * Gets the location of the problem. The location is a user-friendly combination of the values from
     * {@link #getSource()}, {@link #getLineNumber()} and {@link #getColumnNumber()}. The exact syntax of the returned
     * value is undefined.
     *
     * @return the location of the problem, never {@code null}
     */
    @Nonnull
    String getLocation();

    /**
     * Gets the exception that caused this problem (if any).
     *

func NewChecksumWithType(alg ChecksumType, value string) *Checksum {
	if !alg.IsSet() {
		return nil
	}
	wantParts := 0
	if strings.ContainsRune(value, '-') {
		valSplit := strings.Split(value, "-")
		if len(valSplit) != 2 {
			return nil
		}
		value = valSplit[0]
		nParts, err := strconv.Atoi(valSplit[1])
		if err != nil {
			return nil
		}

And it will save the returned value in a <abbr title="A utility/system to store computed/generated values, to reuse them instead of computing them again.">"cache"</abbr> and pass it to all the "dependants" that need it in that specific request, instead of calling the dependency multiple times for the same request.

---

Но если вам любопытен именно этот пример и всё ещё интересно, вот немного подробностей.

#### Строка и `value.startswith()` { #string-with-value-startswith }

Заметили? Метод строки `value.startswith()` может принимать кортеж — тогда будет проверено каждое значение из кортежа:

{* ../../docs_src/query_params_str_validations/tutorial015_an_py310.py ln[16:19] hl[17] *}