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Apprentice

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Exam →Stats →Learning Path

Number

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Exercises (105)

○Number() — converting strings to numbers
Beginner
○Number() — converting booleans
Beginner
○Number() — null becomes 0
Beginner
○Number() — undefined becomes NaN
Beginner
○Number() vs new Number() — object vs primitive
Intermediate
○Number.EPSILON — the value
Intermediate
○Number.EPSILON — floating point addition problem
Intermediate
○Number.EPSILON — epsilon-based equality check
Intermediate
○Number.EPSILON — type check
Beginner
○Number.EPSILON — usage in tolerance comparison
Intermediate
○Number.MAX_SAFE_INTEGER — the value
Beginner
○Number.MAX_SAFE_INTEGER — adding 1 loses precision
Intermediate
○Number.MAX_SAFE_INTEGER — isSafeInteger at boundary
Beginner
○Number.MAX_SAFE_INTEGER — type
Beginner
○Number.MAX_SAFE_INTEGER — usage in loop bounds
Intermediate
○Number.MAX_VALUE — comparison with large numbers
Beginner
○Number.MAX_VALUE — overflow to Infinity
Intermediate
○Number.MAX_VALUE — type
Beginner
○Number.MAX_VALUE — isFinite check
Beginner
○Number.MAX_VALUE — multiplication beyond MAX_VALUE
Intermediate
○Number.MIN_SAFE_INTEGER — the value
Beginner
○Number.MIN_SAFE_INTEGER — relationship to MAX_SAFE_INTEGER
Beginner
○Number.MIN_SAFE_INTEGER — isSafeInteger at boundary
Intermediate
○Number.MIN_SAFE_INTEGER — type
Beginner
○Number.MIN_SAFE_INTEGER — negative precision loss
Intermediate
○Number.MIN_VALUE — it is positive!
Beginner
○Number.MIN_VALUE — comparison with 0
Beginner
○Number.MIN_VALUE — type
Beginner
○Number.MIN_VALUE — smaller than any other positive float
Intermediate
○Number.MIN_VALUE — division beyond MIN_VALUE returns 0
Intermediate
○Number.NaN — NaN is not equal to itself
Beginner
○Number.NaN — isNaN check
Beginner
○Number.NaN — typeof
Beginner
○Number.NaN — Number.isNaN vs global isNaN
Intermediate
○Number.NaN — producing NaN through operations
Beginner
○Number.NEGATIVE_INFINITY — equals -Infinity
Beginner
○Number.NEGATIVE_INFINITY — comparison with MIN_VALUE
Beginner
○Number.NEGATIVE_INFINITY — -1/0
Beginner
○Number.NEGATIVE_INFINITY — isFinite returns false
Beginner
○Number.NEGATIVE_INFINITY — typeof
Beginner
○Number.POSITIVE_INFINITY — equals Infinity
Beginner
○Number.POSITIVE_INFINITY — comparison with MAX_VALUE
Beginner
○Number.POSITIVE_INFINITY — 1/0
Beginner
○Number.POSITIVE_INFINITY — isFinite returns false
Beginner
○Number.POSITIVE_INFINITY — typeof
Beginner
○Number.isFinite() — finite number returns true
Beginner
○Number.isFinite() — Infinity returns false
Beginner
○Number.isFinite() — -Infinity returns false
Beginner
○Number.isFinite() — NaN returns false
Beginner
○Number.isFinite() — no coercion unlike global isFinite
Intermediate
○Number.isInteger() — integer returns true
Beginner
○Number.isInteger() — 4.0 is an integer
Beginner
○Number.isInteger() — 4.5 is not an integer
Beginner
○Number.isInteger() — Infinity is not an integer
Beginner
○Number.isInteger() — '4' (string) is not an integer
Beginner
○Number.isNaN() — NaN returns true
Beginner
○Number.isNaN() — regular number returns false
Beginner
○Number.isNaN() — '1' (string) returns false, unlike global isNaN
Intermediate
○Number.isNaN() — undefined returns false, unlike global isNaN
Intermediate
○Number.isNaN() — NaN !== NaN, use Number.isNaN instead
Intermediate
○Number.isSafeInteger() — 42 is safe
Beginner
○Number.isSafeInteger() — MAX_SAFE_INTEGER is safe
Beginner
○Number.isSafeInteger() — MAX_SAFE_INTEGER + 1 is not safe
Intermediate
○Number.isSafeInteger() — 3.0 is a safe integer
Beginner
○Number.isSafeInteger() — 3.1 is not a safe integer
Beginner
○Number.parseFloat() — '3.14' → 3.14
Beginner
○Number.parseFloat() — leading/trailing whitespace ignored
Beginner
○Number.parseFloat() — stops at non-numeric characters
Intermediate
○Number.parseFloat() — empty string returns NaN
Beginner
○Number.parseFloat() — second decimal point stops parsing
Intermediate
○Number.parseInt() — '42' → 42
Beginner
○Number.parseInt() — hex string with radix 16
Intermediate
○Number.parseInt() — binary string with radix 2
Intermediate
○Number.parseInt() — leading/trailing whitespace ignored
Beginner
○Number.parseInt() — 'abc' returns NaN
Beginner
○toExponential() — basic usage
Intermediate
○toExponential() — with fractionDigits
Intermediate
○toExponential() — with 3 decimal places
Intermediate
○toExponential() — large number
Intermediate
○toExponential() — return type is string
Beginner
○toFixed() — basic usage
Beginner
○toFixed() — safe rounding example
Intermediate
○toFixed() — zero with padding
Beginner
○toFixed() — rounding to 0 decimal places
Beginner
○toFixed() — return type is string
Beginner
○toLocaleString() — returns a string
Beginner
○toLocaleString() — zero includes 0
Beginner
○toLocaleString() — en-US locale includes 1 for 1000
Intermediate
○toLocaleString() — result is truthy for various inputs
Beginner
○toLocaleString() — 1.5 includes 1
Beginner
○toPrecision() — 5 significant digits
Intermediate
○toPrecision() — small number
Intermediate
○toPrecision() — large number uses exponential notation
Intermediate
○toPrecision() — no argument returns same as toString
Beginner
○toPrecision() — return type is string
Beginner
○toString() — hex with radix 16
Intermediate
○toString() — binary with radix 2
Intermediate
○toString() — default base 10
Beginner
○toString() — octal with radix 8
Intermediate
○toString() — return type is string
Beginner
○valueOf() — new Number(42).valueOf() === 42
Intermediate
○valueOf() — typeof new Number() is object, valueOf is number
Intermediate
○valueOf() — primitive number.valueOf() === itself
Beginner
○valueOf() — used implicitly in arithmetic
Intermediate
○valueOf() — comparison with primitive
Intermediate