toLocaleLowerCase — GTM Variable Template for String

VARIABLES › STRING

toLocaleLowerCase CORE String

Direct (.tpl) Apply (.tpl)

Converts the input value to locale lowercase string, or returns undefined if the input is not a valid string.

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When to Use This

String Manipulation

Transform, clean, and normalize text data for consistent downstream processing.

Type Conversion

Safely convert between data types — strings, numbers, booleans, arrays, objects.

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Examples

Simple uppercase▶ Try

INPUT

String To Convert: HELLO WORLD

OUTPUT

hello world

Locale-aware lowercase▶ Try

INPUT

String To Convert: HeLLo WoRLd

OUTPUT

hello world

Non-string input returns undefined▶ Try

INPUT

String To Convert: 12345

OUTPUT

undefined

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GTM Configuration

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toLocaleLowerCase

Read-Only Try Live

String To Convert

💾 The value to be converted to locale lowercase.

Supported formats:
  ✓ String

Input Setup

Input Function (optional)

⚙️ Optional pre-processing function applied to the input before internal logic (e.g., convert object to string, normalize case). Internal transformations such as case handling will still apply afterward.

Result Handling

Output Function (optional)

⚙️ Optional function to apply to the result before returning it (e.g., str => str + ' €', val => val !== undefined for boolean conversion). Useful for chaining transformations on the output.

String To Convert string

💡 Type any text to see the result update live

🎯 Using special value — click input to type instead

Test with:

Falsy undefined null "" empty 0 false NaN

Truthy true 42 "hello" {} empty [] empty {a:1} [1,2,3]

🔗 Result Handling — Chain Variables

Chain apply-mode variables to the output. Each variable receives the result of the previous one.

toLocaleLowerCase()

+ Chain another variable

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Related Variables

Same category: String

→ assignParamsToString → charAt → concatenateValues → countWordsInString → endsWith → extract → extractFirstSegment → extractNumber → fromBase64 → indexOf → left → matchAll → matchRegex → omitParamsFromString → padEnd → padStart → pickParamsFromString → replaceAll → replaceAllWithRegex → replaceFirst → right → safeSplit → sanitizeTextAndRemoveHtml → sanitizeTextLite → search → slice → split → startsWith → test → toBase64 → toCamelCase → toJsonString → toKebabCase → toLocaleUpperCase → toLowerCase → toNumber → toSnakeCase → toStartCase → toString → toStringRepresentation → toUpperCase → toUpperFirst → trim → trimEnd → trimStart → truncate

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Under the Hood

📜 View Implementation Code

/**
* Converts the input value to locale lowercase.
* 
* @param {any} data.src - The value to be converted to locale lowercase.
* @param {Function|string} [data.out] - Optional output handler: function to transform result or string with format.
*
* Direct-mode specific parameters:
* @param {Function} [data.pre] - Optional pre-processor function to transform src before conversion.
* 
* @returns {string|undefined} The locale lowercase string, or undefined if the input is not a valid string.
*
* @framework ggLowCodeGTMKit
*/
const toLocaleLowerCase = function(string) {
   return typeof string === 'string' ? string.toLocaleLowerCase() : undefined;
};
const safeFunction = fn => typeof fn === 'function' ? fn : x => x;
const out = safeFunction(data.out);
// ===============================================================================
// toLocaleLowerCase - Direct mode
// ===============================================================================
const applyCast = (castFn, value) => safeFunction(castFn)(value);
const value = applyCast(data.pre, data.src);
return out(toLocaleLowerCase(value));
// ===============================================================================
// toLocaleLowerCase() – Apply Mode
// ===============================================================================
/*
return function(value) {
  return out(toLocaleLowerCase(value));
};
*/

🧪 View Test Scenarios (5 tests)

✅ '[example] Simple uppercase'
✅ '[example] Locale-aware lowercase'
✅ Already lowercase string - should remain lowercase
✅ Empty string - should return empty string
✅ '[example] Non-string input returns undefined'