javascript - React filtering information grabbed from an object -


so have react container working in, , need take information stored in object , filter , use variable. here @ right now:

please ignore lot of things did not filter out, aware way looks there lot of unused variables information being grabbed, used in container.

...  componentdidmount() {   // ... bunch of stuff doing work   // need use categoryid variable inside of here   // categoryid returns /s/a-12345678 need trailing numbers (12345678) }  dvmcontainer.proptypes = {   categoryid: proptypes.string }  const mapstatetoprops = function({ config, page, profile }) {   return {     categoryid: page.metadata.node_id   } }

if node_id in same format, can use:

categoryid: page.metadata.node_id.split('-')[1]

in mapstatetoprops.


alternatively, can use regular expression:

categoryid: page.metadata.node_id.match(/[0-9]+$/)[0]

this matches uninterrupted string of numbers @ end of string.


[edit] document comments in case or else in future has understand why code extracting that. in explanation, focus more on why it's being done , not what it's doing.


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