6 examples of 'check type of variable in javascript' in JavaScript

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442function isTypeVariableInScope(id, state) {
443 return state.g.typeVariableScopeDepth[id.name] > 0;
444}
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339checkVarStatement(
340 statement: VarStatement,
341 define: (name: string, type: any) => void,
342) {
343 const initializerType = this.evaluate(statement.initializer);
344
345 if (statement.type) {
346 const variableType = this.scope.lookup(statement.type);
347 checkTypeAssignable(initializerType, variableType, statement.name);
348 define(statement.name.lexeme, variableType);
349 } else if (initializerType) {
350 define(statement.name.lexeme, initializerType);
351 } else {
352 error(statement.name, "cannot declare without type");
353 }
354}
3function getVariableType(variable) {
4 if (typeof variable == 'object') {
5 if (variable instanceof Function) {
6 return 'function';
7 } else if (variable instanceof Array) {
8 return 'array';
9 } else if (variable instanceof HTMLElement) {
10 return 'html'
11 }
12
13 return 'object';
14 }
15
16 return typeof variable;
17}
189function isVarType(t) {
190 return (t.type === 'var');
191}
47function checkVariable(decl: TSESTree.VariableDeclaration, context: Rule.RuleContext) {
48 if (decl.declare) {
49 return;
50 }
51 decl.declarations.forEach(declaration =>
52 resolveIdentifiers(declaration.id).forEach(id =>
53 raiseOnInvalidIdentifier(id, "local variable", context),
54 ),
55 );
56}
28function checkType(type) {
29 const isArray = Array.isArray(input)
30 return type == 'array' && isArray || (type === typeof input && !isArray)
31}

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