Some functions in JavaScript.


function isDigit(c) {
return c >='0' && c <= '9';
}

function isLetter(c) {
return (c >= 'a' && c <='z' || c>='A' && c <='Z');
}

function isWhiteSpace(c) {
return ((c=== ' ') || (c === '\n') || (c==='\t'));
}

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