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add a null checking for a Trait target #21

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add a null checking for a Trait target #21

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2 changes: 1 addition & 1 deletion JavaScript/trait.js
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Original file line number Diff line number Diff line change
Expand Up @@ -37,7 +37,7 @@ class Trait {
}

implement(target, callable) {
if (typeof target !== 'object') {
if (typeof target !== 'object' || target === null) {
throw new TypeError(`Target is not Object`);
}
if (typeof callable !== 'function') {
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