Converting to lower case with Jexl and making replacements in the text

Currently, my code uses the jexl.eval function to evaluate a value like so:

jexl.eval("dataset[0].data['Entity Name'].toLowerCase().replace(/ /g, '_')", data);

The value of dataset[0].data['Entity Name'] is always a string and never null. However, there seems to be an error in jexl.eval as it consistently returns an empty string.

I am uncertain whether toLowerCase() and replace() are supported functions in this context or if there may be a syntax issue in my code?

For further exploration, you can check out this jexl playground tool for further investigation.

javascriptnpmjexl

Answer №1

When working with string manipulation, make sure to use the correct syntax for methods like <code>toLowerCase()
and replace. Incorrect syntax could lead to unexpected results.

If you are using JEXL, remember that you can chain transformations using the | (pipe) operator. To do this correctly, define the transform functions for toLowerCase and replace before incorporating them in your JEXL expression. Here is an example:

jexl.eval("dataset[0].data['Entity Name'] | lower | replace(' ', '_')", data);

// Transformations 
jexl.addTransform('lower', (val) => val.toLowerCase());
jexl.addTransform('replace', (val, search, replacement) => val.replace(new RegExp(search, 'g'), replacement));

Explore the JEXL playground for further practice!

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