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12 lines
322 B
Markdown
12 lines
322 B
Markdown
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```
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let str = ` hello world ! `;
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let _trim = function () {
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if (typeof this == "number") new Error("Invalid or unexpected token");
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if (typeof this !== "string")
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new Error("Cannot read property 'trim' of" + this);
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let reg = /^\s*|\s*$/g;
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return this.replace(reg, "");
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};
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String.prototype._trim = _trim;
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```
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