multiply — GTM Variable Template for Number

VARIABLES › NUMBER

multiply CORE Number

Direct (.tpl) Apply (.tpl)

Multiplies two numbers and returns the product. Returns undefined if invalid.

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When to Use This

Number Operations

Arithmetic, rounding, clamping, and mathematical transformations on numeric values.

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Examples

Multiply positive numbers▶ Try

INPUT

First Number: 5
Second Number: 3

OUTPUT

15

String numbers multiplied▶ Try

INPUT

First Number: 6
Second Number: 7

OUTPUT

42

Invalid returns undefined▶ Try

INPUT

First Number: hello
Second Number: 5

OUTPUT

undefined

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GTM Configuration

This is what you'll see when you open this variable in Google Tag Manager. Hover the icons for details.

multiply

Read-Only Try Live

First Number

💾 The first number to multiply.

Supported formats:
  ✓ Number
  ✓ String

Second Number

💾 The second number to multiply.

Supported formats:
  ✓ Number
  ✓ 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.

First Number number

💡 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]

Second Number number

🔗 Result Handling — Chain Variables

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

multiply()

+ Chain another variable

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Related Variables

Same category: Number

→ absolute → addValues → calculateDiffRatio → calculateRatioPercentage → ceil → clamp → classifyByThreshold → countDigits → divide → floor → max → min → parseFloatValue → parseIntValue → squareRoot → subtractValues → toFixed → toInteger

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Under the Hood

📜 View Implementation Code

/**
* Multiplies two numbers and returns the result.
* 
* @param {*} data.src - The first number to multiply.
* @param {*} data.mul - The second number to multiply.
* @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 multiplication.
* 
* @returns {number|undefined} The result of the multiplication, or undefined if inputs are invalid.
*
* @framework ggLowCodeGTMKit
*/
const makeNumber = require('makeNumber');

const multiply = function(num1, num2) {
   const number1 = makeNumber(num1);
   const number2 = makeNumber(num2);
   if (number1 === number1 && number2 === number2) {
       return number1 * number2;
   }
   return undefined;
};
const safeFunction = fn => typeof fn === 'function' ? fn : x => x;
const out = safeFunction(data.out);
// ===============================================================================
// multiply - Direct mode
// ===============================================================================
const applyCast = (castFn, value) => safeFunction(castFn)(value);
const value = applyCast(data.pre, data.src);
return out(multiply(value, data.mul));
// ===============================================================================
// multiply(...) – Apply Mode
// ===============================================================================
/*
return function(value, multiplier) {
   multiplier = data.rp1 ? data.mul : multiplier;
   return out(multiply(value, multiplier));
};
*/

🧪 View Test Scenarios (5 tests)

✅ '[example] Multiply positive numbers'
✅ Negative number multiplication - should return negative product
✅ '[example] String numbers multiplied'
✅ Decimal numbers - should handle decimals
✅ '[example] Invalid returns undefined'