3 examples of 'isstring javascript' in JavaScript

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function IsFunctionString(str) {
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	try {
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		let f = eval(`(${str})`);
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		return (typeof f) == "function";
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	} catch (error) {
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		return false;
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	}
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}

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isJavaScript({ allowParameters = false } = {}) {
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  switch (this._type) {
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    case "text": {
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      switch (this._subtype) {
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        case "ecmascript":
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        case "javascript":
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        case "javascript1.0":
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        case "javascript1.1":
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        case "javascript1.2":
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        case "javascript1.3":
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        case "javascript1.4":
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        case "javascript1.5":
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        case "jscript":
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        case "livescript":
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        case "x-ecmascript":
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        case "x-javascript": {
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          return allowParameters || this._parameters.size === 0;
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        }
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        default: {
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          return false;
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        }
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      }
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    }
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    case "application": {
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      switch (this._subtype) {
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        case "ecmascript":
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        case "javascript":
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        case "x-ecmascript":
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        case "x-javascript": {
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          return allowParameters || this._parameters.size === 0;
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        }
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        default: {
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          return false;
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        }
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      }
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    }
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    default: {
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      return false;
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    }
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  }
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}

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function isString(value) {
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  return typeof value == 'string' ||
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    (value && typeof value == 'object' && toString.call(value) == stringClass) || false;
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}