LET function

PRO

The LET function in Jspreadsheet Formulas Pro is a powerful tool that lets you perform a calculation within a formula and then use the outcome of that calculation multiple times within the same formula. You can do this by assigning a name to the calculation. This not only simplifies your formulas by reducing repetition, but also improves computational efficiency, especially with large and complex spreadsheets.

Documentation

Allows you to define a calculation inside a formula and use the result of that calculation throughout the formula by referencing the name you give to the calculation.

Syntax

LET(name1, name_value1, [calculation_or_name2, name_value2], ...)

Parameter	Description
`name1`	The name you want to give to the calculation. Must be a valid cell reference or range name.
`name_value1`	The value of the first name.
`[calculation_or_nameN]`	Optional: Additional names or expression for more calculations.
`[name_valueN]`	Optional: Value for the nth name.

Behavior

The LET function is used to define variables within a formula, simplifying complex formulas. The function takes a series of variables and a calculation that uses these variables. Here's how it handles various data types:

Empty cells: If a variable is assigned to an empty cell, LET treats it as zero in numeric calculations.
Text: LET can handle text values. If a variable is assigned to a cell containing text, it treats it as a text string. However, if this variable is used in a numeric calculation, it results in an error.
Booleans: LET can handle boolean values. If a variable is assigned to a cell containing a boolean, it treats it as TRUE or FALSE.
Errors: If a variable is assigned to a cell containing an error, the LET function propagates this error through to the final result.

Common Errors

Error	Description
#VALUE!	This error occurs if a variable is used in an inappropriate context, such as trying to perform numeric calculations on text strings.
#CALC!	This error occurs if the `LET` function attempts to calculate a formula that contains a circular reference.

Best practices

Always ensure that all the variables used in the LET function calculation are defined within the function itself to avoid the #NAME? error.

Use meaningful names for your variables. This makes your formulas easier to read and understand.

Be careful when assigning variables to cells that may contain text or errors. If these variables are used in numeric calculations, it can result in errors.

Avoid creating circular references within your LET function to prevent the #CALC! error.

Usage

A few examples using the LET function.

LET(x, A1 + B1) + LET(y, A2 + B2) returns the sum of the values in cells A1 through B2, with the intermediate results stored in the names x and y, respectively  
LET(area, PI() * radius ^ 2) returns the area of a circle with radius defined elsewhere in the worksheet  
LET(total_sales, SUM(A1:A10)) / LET(num_salespeople, COUNTA(B1:B10)) returns the average sales per salesperson for the range A1:A10, with the intermediate results stored in the names total_sales and num_salespeople, respectively.

Interactive Spreadsheet Demo

<html>
<script src="https://jspreadsheet.com/v11/jspreadsheet.js"></script>
<script src="https://jsuites.net/v5/jsuites.js"></script>
<link rel="stylesheet" href="https://jsuites.net/v5/jsuites.css" type="text/css" />
<link rel="stylesheet" href="https://jspreadsheet.com/v11/jspreadsheet.css" type="text/css" />

<link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Material+Icons" />
<script src="https://cdn.jsdelivr.net/npm/@jspreadsheet/formula-pro/dist/index.min.js"></script>

<div id="spreadsheet"></div>

<script>
// Set your JSS license key (The following key only works for one day)
jspreadsheet.setLicense('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');

// Set the extensions
jspreadsheet.setExtensions({ formula });

// Create a new spreadsheet
jspreadsheet(document.getElementById('spreadsheet'), {
  worksheets: [{
    data: [
    [
        "Product",
        "Units Sold",
        "Price per Unit",
        "Revenue Analysis"
    ],
    [
        "Laptops",
        25,
        899,
        "=LET(total_revenue, B2*C2, avg_price, (C2+C3+C4)/3, total_revenue/avg_price)"
    ],
    [
        "Tablets",
        18,
        549
    ],
    [
        "Phones",
        42,
        299
    ],
    [
        "Total Units",
        "=SUM(B2:B4)",
        "Avg Price",
        "=LET(prices, C2:C4, AVERAGE(prices))"
    ]
]
  }]
});
</script>
</html>

import React, { useRef } from "react";
import { Spreadsheet, Worksheet, jspreadsheet } from "@jspreadsheet/react";
import formula from "@jspreadsheet/formula-pro";
import "jsuites/dist/jsuites.css";
import "jspreadsheet/dist/jspreadsheet.css";

// Set license
jspreadsheet.setLicense('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');

// Set the extensions
jspreadsheet.setExtensions({ formula });

export default function App() {
    // Spreadsheet array of worksheets
    const spreadsheet = useRef();

    // Worksheet data
    const data = [
    [
        "Product",
        "Units Sold",
        "Price per Unit",
        "Revenue Analysis"
    ],
    [
        "Laptops",
        25,
        899,
        "=LET(total_revenue, B2*C2, avg_price, (C2+C3+C4)/3, total_revenue/avg_price)"
    ],
    [
        "Tablets",
        18,
        549
    ],
    [
        "Phones",
        42,
        299
    ],
    [
        "Total Units",
        "=SUM(B2:B4)",
        "Avg Price",
        "=LET(prices, C2:C4, AVERAGE(prices))"
    ]
];

    // Render component
    return (
        <Spreadsheet ref={spreadsheet}>
            <Worksheet data={data} />
        </Spreadsheet>
    );
}

<template>
    <Spreadsheet ref="spreadsheet">
        <Worksheet :data="data" />
    </Spreadsheet>
</template>

<script>
import { Spreadsheet, Worksheet, jspreadsheet } from "@jspreadsheet/vue";
import "jsuites/dist/jsuites.css";
import "jspreadsheet/dist/jspreadsheet.css";
import formula from "@jspreadsheet/formula-pro";

// Set license
jspreadsheet.setLicense('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');

// Set the extensions
jspreadsheet.setExtensions({ formula });

export default {
    components: {
        Spreadsheet,
        Worksheet,
    },
    data() {
        // Worksheet data
        const data = [
    [
        "Product",
        "Units Sold",
        "Price per Unit",
        "Revenue Analysis"
    ],
    [
        "Laptops",
        25,
        899,
        "=LET(total_revenue, B2*C2, avg_price, (C2+C3+C4)/3, total_revenue/avg_price)"
    ],
    [
        "Tablets",
        18,
        549
    ],
    [
        "Phones",
        42,
        299
    ],
    [
        "Total Units",
        "=SUM(B2:B4)",
        "Avg Price",
        "=LET(prices, C2:C4, AVERAGE(prices))"
    ]
]

        return {
            data
        };
    }
}
</script>

import { Component, ViewChild, ElementRef } from "@angular/core";
import jspreadsheet from "jspreadsheet";
import * as formula from "@jspreadsheet/formula-pro";

// Set your JSS license key (The following key only works for one day)
jspreadsheet.setLicense('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');

// Set the extensions
jspreadsheet.setExtensions({ formula });

@Component({
    standalone: true,
    selector: "app-root",
    template: `<div #spreadsheet></div>`
})
export class AppComponent {
    @ViewChild("spreadsheet") spreadsheet: ElementRef;
    // Worksheets
    worksheets: jspreadsheet.worksheetInstance[];

    // Create a new data grid
    ngAfterViewInit() {
        // Create spreadsheet
        this.worksheets = jspreadsheet(this.spreadsheet.nativeElement, {
            worksheets: [{
                data: [
    [
        "Product",
        "Units Sold",
        "Price per Unit",
        "Revenue Analysis"
    ],
    [
        "Laptops",
        25,
        899,
        "=LET(total_revenue, B2*C2, avg_price, (C2+C3+C4)/3, total_revenue/avg_price)"
    ],
    [
        "Tablets",
        18,
        549
    ],
    [
        "Phones",
        42,
        299
    ],
    [
        "Total Units",
        "=SUM(B2:B4)",
        "Avg Price",
        "=LET(prices, C2:C4, AVERAGE(prices))"
    ]
]
            }]
        });
    }
}

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