@jdiefenbaugh : Could you explain to me this part please ?

renderLibraries = () => (
                <TabPane tabId='2'>
                        <Row>
                                <Col sm='12'>
                                        {
                                                // loop through all the used libs
                                                (Object.entries(this.props.data.contents.uses): [string, any][])
                                                .map(([name, lib], i, lEntries) => (
                                                        <TypedField
                                                                key={i}
                                                                name={name}
                                                                type={lib}
                                                                types={this.props.libraries.map(l => l.name)}
                                                                existingFields={lEntries.map(([n, v]) => n)}
                                                                nameUpdateFunc={str => {
                                                                        // update the alias
                                                                        this.changeContentsVal('uses',
                                                                                changeObjFieldName(
                                                                                        this.props.data.contents.uses,
                                                                                        name,
                                                                                        str
                                                                                )
                                                                        );
                                                                }}
                                                                typeUpdateFunc={str => {
                                                                        // update the chosen library for the alias
                                                                        const libs = {
                                                                                ...this.props.data.contents.uses,
                                                                                [name]: str
                                                                        };
                                                                        this.changeContentsVal('uses', libs);
                                                                }}
                                                                deleteFunc={() => {
                                                                        const libs = { ...this.props.data.contents.uses };
                                                                        delete libs[name];
                                                                        this.changeContentsVal('uses', libs);
                                                                }}
                                                        />
                                                ))
                                        }
                                </Col>
                        </Row>
                        <Button outline block
                                id='newLibraryBtn'
                                onClick={() => {
                                        const newKey = generateNewKey('library', Object.keys(this.props.data.contents.uses));
                                        this.changeContentsVal('uses',
                                                {
                                                        ...this.props.data.contents.uses,
                                                        [newKey]: ''
                                                }
                                        );
                                }}
                        >
                                New Library
                        </Button>
                </TabPane>
        );

What actually interests me is what is inside the loop (// loop through all the used libs)

Could you explain to me a bit please and point me to some documentation you read to write this kind of stuff?

Thanks