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RangeError: repeat count must be non-negative - JavaScript | MDN
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RangeError: repeat count must be non-negative

RangeError: repeat count must be non-negative (Firefox)
RangeError: Invalid count value (Chrome)

In this article

RangeError

?

String.prototype.repeat(), count, . 0 Infinity, . : [0, + ).

js
"abc".repeat(-1); // RangeError

js
"abc".repeat(0); // ''
"abc".repeat(1); // 'abc'
"abc".repeat(2); // 'abcabc'
"abc".repeat(3.5); // 'abcabcabc' (count will be converted to integer)

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