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Fix edge case with rendering children as number 0 #18

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Fix edge case with rendering children as number 0 #18

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88278a1
fix edge case with rendering children as number 0
dburles Mar 18, 2019
015b1b9
don't attempt to render null children
dburles Mar 18, 2019
b3bd6bc
Merge branch 'master' into master
developit May 23, 2019
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2 changes: 1 addition & 1 deletion src/vhtml.js
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Original file line number Diff line number Diff line change
Expand Up @@ -36,7 +36,7 @@ export default function h(name, attrs) {

while (stack.length) {
let child = stack.pop();
if (child) {
if (child !== undefined && child !== null) {
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This would allow <div>{true}</div> to render <div>true</div>. Do we want that? The VDOM libs ignore booleans.

In any case, this statement can compress to:

Suggested change
if (child !== undefined && child !== null) {
if (child != null) {

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It also allowed it before so we could leave as is or correct it, up to you. The shorter version while shorter is not explicit, it's better to always use the === and !== operators. Just my thoughts.

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I would concur with @dburles that being more explicit is often clearer. Also on the <div>{true}</div> debate mimicking the behaviour of React/Preact etc. seems intuitive.

if (child.pop) {
for (let i=child.length; i--; ) stack.push(child[i]);
}
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27 changes: 27 additions & 0 deletions test/vhtml.js
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Expand Up @@ -165,4 +165,31 @@ describe('vhtml', () => {
'<div class="my-class" for="id"></div>'
);
});

it('should render a child of 0', () => {
function Child ({ children }) {
return <span>{children}</span>;
}
expect(
<div><Child>{0}</Child></div>
).to.equal(
'<div><span>0</span></div>'
);
});

it('should not attempt to render a child of null or undefined', () => {
function Child ({ children }) {
return <span>{children}</span>;
}
expect(
<div><Child>{null}</Child></div>
).to.equal(
'<div><span></span></div>'
);
expect(
<div><Child>{undefined}</Child></div>
).to.equal(
'<div><span></span></div>'
);
});
});